1539760981 has 4 divisors (see below), whose sum is σ = 1679739264. Its totient is φ = 1399782700.

The previous prime is 1539760951. The next prime is 1539760987. The reversal of 1539760981 is 1890679351.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1539760981 - 2⁷ = 1539760853 is a prime.

It is a super-2 number, since 2×1539760981² = 4741727757220164722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1539760987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69989125 + ... + 69989146.

It is an arithmetic number, because the mean of its divisors is an integer number (419934816).

Almost surely, 2^1539760981 is an apocalyptic number.

1539760981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1539760981 is a deficient number, since it is larger than the sum of its proper divisors (139978283).

1539760981 is a wasteful number, since it uses less digits than its factorization.

1539760981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139978282.

The product of its (nonzero) digits is 408240, while the sum is 49.

The square root of 1539760981 is about 39239.7882384704. The cubic root of 1539760981 is about 1154.7406027794.

The spelling of 1539760981 in words is "one billion, five hundred thirty-nine million, seven hundred sixty thousand, nine hundred eighty-one".