1561352825 has 12 divisors (see below), whose sum is σ = 1988405100. Its totient is φ = 1215322560.

The previous prime is 1561352809. The next prime is 1561352827. The reversal of 1561352825 is 5282531651.

It can be written as a sum of positive squares in 6 ways, for example, as 14661241 + 1546691584 = 3829^2 + 39328^2 .

It is not a de Polignac number, because 1561352825 - 2⁴ = 1561352809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1561352827) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 843050 + ... + 844899.

It is an arithmetic number, because the mean of its divisors is an integer number (165700425).

Almost surely, 2^1561352825 is an apocalyptic number.

It is an amenable number.

1561352825 is a deficient number, since it is larger than the sum of its proper divisors (427052275).

1561352825 is a wasteful number, since it uses less digits than its factorization.

1561352825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1687996 (or 1687991 counting only the distinct ones).

The product of its digits is 72000, while the sum is 38.

The square root of 1561352825 is about 39513.9573442094. The cubic root of 1561352825 is about 1160.1131540926.

The spelling of 1561352825 in words is "one billion, five hundred sixty-one million, three hundred fifty-two thousand, eight hundred twenty-five".