1097971825 has 6 divisors (see below), whose sum is σ = 1361485094. Its totient is φ = 878377440.

The previous prime is 1097971793. The next prime is 1097971837. The reversal of 1097971825 is 5281797901.

It can be written as a sum of positive squares in 3 ways, for example, as 14837904 + 1083133921 = 3852^2 + 32911^2 .

It is not a de Polignac number, because 1097971825 - 2⁵ = 1097971793 is a prime.

It is a Duffinian 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, 21959412 + ... + 21959461.

Almost surely, 2^1097971825 is an apocalyptic number.

It is an amenable number.

1097971825 is a deficient number, since it is larger than the sum of its proper divisors (263513269).

1097971825 is an equidigital number, since it uses as much as digits as its factorization.

1097971825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43918883 (or 43918878 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 49.

The square root of 1097971825 is about 33135.6579080603. The cubic root of 1097971825 is about 1031.6452873371.

The spelling of 1097971825 in words is "one billion, ninety-seven million, nine hundred seventy-one thousand, eight hundred twenty-five".