1013497861538 has 18 divisors (see below), whose sum is σ = 1574540905041. Its totient is φ = 489254897544.

The previous prime is 1013497861531. The next prime is 1013497861543. The reversal of 1013497861538 is 8351687943101.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1012895306329 + 602555209 = 1006427^2 + 24547^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=711863.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1013497861531) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 41275781 + ... + 41300327.

Almost surely, 2^{1013497861538} is an apocalyptic number.

1013497861538 is a deficient number, since it is larger than the sum of its proper divisors (561043043503).

1013497861538 is an frugal number, since it uses more digits than its factorization.

1013497861538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49154 (or 24578 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 56.

The spelling of 1013497861538 in words is "one trillion, thirteen billion, four hundred ninety-seven million, eight hundred sixty-one thousand, five hundred thirty-eight".