1971885925 has 6 divisors (see below), whose sum is σ = 2445138578. Its totient is φ = 1577508720.

The previous prime is 1971885901. The next prime is 1971885953. The reversal of 1971885925 is 5295881791.

It can be written as a sum of positive squares in 3 ways, for example, as 43007364 + 1928878561 = 6558^2 + 43919^2 .

It is not a de Polignac number, because 1971885925 - 2⁹ = 1971885413 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, 39437694 + ... + 39437743.

Almost surely, 2^1971885925 is an apocalyptic number.

It is an amenable number.

1971885925 is a deficient number, since it is larger than the sum of its proper divisors (473252653).

1971885925 is an equidigital number, since it uses as much as digits as its factorization.

1971885925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78875447 (or 78875442 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 55.

The square root of 1971885925 is about 44405.9221838709. The cubic root of 1971885925 is about 1253.9895836973.

The spelling of 1971885925 in words is "one billion, nine hundred seventy-one million, eight hundred eighty-five thousand, nine hundred twenty-five".