1509681573481 has 3 divisors (see below), whose sum is σ = 1509682802173. Its totient is φ = 1509680344790.

The previous prime is 1509681573467. The next prime is 1509681573487. The reversal of 1509681573481 is 1843751869051.

The square root of 1509681573481 is 1228691.

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 is not a de Polignac number, because 1509681573481 - 2⁹ = 1509681572969 is a prime.

It is a super-2 number, since 2×1509681573481² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1509681573487) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 614346 + ... + 1843036.

Almost surely, 2^{1509681573481} is an apocalyptic number.

1509681573481 is the 1228691-st square number.

1509681573481 is the 614346-th centered octagonal number.

It is an amenable number.

1509681573481 is a deficient number, since it is larger than the sum of its proper divisors (1228692).

1509681573481 is an frugal number, since it uses more digits than its factorization.

1509681573481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2457382 (or 1228691 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 58.

The spelling of 1509681573481 in words is "one trillion, five hundred nine billion, six hundred eighty-one million, five hundred seventy-three thousand, four hundred eighty-one".