1254051521 has 4 divisors (see below), whose sum is σ = 1255475844. Its totient is φ = 1252627200.

The previous prime is 1254051457. The next prime is 1254051541. The reversal of 1254051521 is 1251504521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 602015296 + 652036225 = 24536^2 + 25535^2 .

It is a cyclic number.

It is not a de Polignac number, because 1254051521 - 2⁶ = 1254051457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1254051541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 710840 + ... + 712601.

It is an arithmetic number, because the mean of its divisors is an integer number (313868961).

Almost surely, 2^1254051521 is an apocalyptic number.

It is an amenable number.

1254051521 is a deficient number, since it is larger than the sum of its proper divisors (1424323).

1254051521 is an equidigital number, since it uses as much as digits as its factorization.

1254051521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1424322.

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 1254051521 is about 35412.5898657525. The cubic root of 1254051521 is about 1078.3799215170.

The spelling of 1254051521 in words is "one billion, two hundred fifty-four million, fifty-one thousand, five hundred twenty-one".