1561625487 has 10 divisors (see below), whose sum is σ = 2332798688. Its totient is φ = 1041083604.

The previous prime is 1561625477. The next prime is 1561625489. The reversal of 1561625487 is 7845261651.

1561625487 is a `hidden beast` number, since 1 + 5 + 6 + 162 + 5 + 487 = 666.

It is not a de Polignac number, because 1561625487 - 2²⁰ = 1560576911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561625489) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 9639583 + ... + 9639744.

Almost surely, 2^1561625487 is an apocalyptic number.

1561625487 is a deficient number, since it is larger than the sum of its proper divisors (771173201).

1561625487 is an equidigital number, since it uses as much as digits as its factorization.

1561625487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19279339 (or 19279330 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The square root of 1561625487 is about 39517.4073921860. The cubic root of 1561625487 is about 1160.1806810809.

The spelling of 1561625487 in words is "one billion, five hundred sixty-one million, six hundred twenty-five thousand, four hundred eighty-seven".