1561340136 has 32 divisors (see below), whose sum is σ = 3908822400. Its totient is φ = 519717120.

The previous prime is 1561340107. The next prime is 1561340173. The reversal of 1561340136 is 6310431651.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27985 + ... + 62496.

It is an arithmetic number, because the mean of its divisors is an integer number (122150700).

Almost surely, 2^1561340136 is an apocalyptic number.

It is an amenable number.

1561340136 is an abundant number, since it is smaller than the sum of its proper divisors (2347482264).

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

1561340136 is a wasteful number, since it uses less digits than its factorization.

1561340136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91209 (or 91205 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 1561340136 is about 39513.7967803652. The cubic root of 1561340136 is about 1160.1100113659.

Adding to 1561340136 its reverse (6310431651), we get a palindrome (7871771787).

The spelling of 1561340136 in words is "one billion, five hundred sixty-one million, three hundred forty thousand, one hundred thirty-six".