1561264525 has 6 divisors (see below), whose sum is σ = 1935968042. Its totient is φ = 1249011600.

The previous prime is 1561264489. The next prime is 1561264531. The reversal of 1561264525 is 5254621651.

It can be written as a sum of positive squares in 3 ways, for example, as 4251844 + 1557012681 = 2062^2 + 39459^2 .

It is not a de Polignac number, because 1561264525 - 2²⁹ = 1024393613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31225266 + ... + 31225315.

Almost surely, 2^1561264525 is an apocalyptic number.

It is an amenable number.

1561264525 is a deficient number, since it is larger than the sum of its proper divisors (374703517).

1561264525 is an equidigital number, since it uses as much as digits as its factorization.

1561264525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62450591 (or 62450586 counting only the distinct ones).

The product of its digits is 72000, while the sum is 37.

The square root of 1561264525 is about 39512.8400017007. The cubic root of 1561264525 is about 1160.0912841858.

The spelling of 1561264525 in words is "one billion, five hundred sixty-one million, two hundred sixty-four thousand, five hundred twenty-five".