1561335492 has 12 divisors (see below), whose sum is σ = 3643116176. Its totient is φ = 520445160.

The previous prime is 1561335487. The next prime is 1561335497. The reversal of 1561335492 is 2945331651.

It is an interprime number because it is at equal distance from previous prime (1561335487) and next prime (1561335497).

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 1561335492.

It is not an unprimeable number, because it can be changed into a prime (1561335497) 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, 65055634 + ... + 65055657.

Almost surely, 2^1561335492 is an apocalyptic number.

1561335492 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1561335492 is an abundant number, since it is smaller than the sum of its proper divisors (2081780684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1561335492 is a wasteful number, since it uses less digits than its factorization.

1561335492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130111298 (or 130111296 counting only the distinct ones).

The product of its digits is 97200, while the sum is 39.

The square root of 1561335492 is about 39513.7380160369. The cubic root of 1561335492 is about 1160.1088611668.

The spelling of 1561335492 in words is "one billion, five hundred sixty-one million, three hundred thirty-five thousand, four hundred ninety-two".