1540480627921 has 3 divisors (see below), whose sum is σ = 1540481869083. Its totient is φ = 1540479386760.

The previous prime is 1540480627841. The next prime is 1540480627949. The reversal of 1540480627921 is 1297260840451.

The square root of 1540480627921 is 1241161.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 978340570321 + 562140057600 = 989111^2 + 749760^2 .

It is not a de Polignac number, because 1540480627921 - 2⁷ = 1540480627793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1540480627951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 620581 + ... + 1861741.

It is an arithmetic number, because the mean of its divisors is an integer number (513493956361).

Almost surely, 2^{1540480627921} is an apocalyptic number.

1540480627921 is the 1241161-st square number.

1540480627921 is the 620581-st centered octagonal number.

It is an amenable number.

1540480627921 is a deficient number, since it is larger than the sum of its proper divisors (1241162).

1540480627921 is an frugal number, since it uses more digits than its factorization.

1540480627921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2482322 (or 1241161 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 49.

Multiplying 1540480627921 by its sum of digits (49), we get a square (75483550768129 = 8688127²).

The spelling of 1540480627921 in words is "one trillion, five hundred forty billion, four hundred eighty million, six hundred twenty-seven thousand, nine hundred twenty-one".