1561262585 has 16 divisors (see below), whose sum is σ = 1987191360. Its totient is φ = 1174230720.

The previous prime is 1561262569. The next prime is 1561262603. The reversal of 1561262585 is 5852621651.

It is not a de Polignac number, because 1561262585 - 2⁴ = 1561262569 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50282 + ... + 75171.

It is an arithmetic number, because the mean of its divisors is an integer number (124199460).

Almost surely, 2^1561262585 is an apocalyptic number.

It is an amenable number.

1561262585 is a deficient number, since it is larger than the sum of its proper divisors (425928775).

1561262585 is a wasteful number, since it uses less digits than its factorization.

1561262585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125608.

The product of its digits is 144000, while the sum is 41.

The square root of 1561262585 is about 39512.8154527110. The cubic root of 1561262585 is about 1160.0908036825.

The spelling of 1561262585 in words is "one billion, five hundred sixty-one million, two hundred sixty-two thousand, five hundred eighty-five".