2157824425 has 6 divisors (see below), whose sum is σ = 2675702318. Its totient is φ = 1726259520.

The previous prime is 2157824413. The next prime is 2157824429. The reversal of 2157824425 is 5244287512.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 12559936 + 2145264489 = 3544^2 + 46317^2 .

It is not a de Polignac number, because 2157824425 - 2¹⁷ = 2157693353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2157824429) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43156464 + ... + 43156513.

Almost surely, 2^2157824425 is an apocalyptic number.

2157824425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2157824425 is a deficient number, since it is larger than the sum of its proper divisors (517877893).

2157824425 is an equidigital number, since it uses as much as digits as its factorization.

2157824425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86312987 (or 86312982 counting only the distinct ones).

The product of its digits is 179200, while the sum is 40.

The square root of 2157824425 is about 46452.3887975635. The cubic root of 2157824425 is about 1292.2266743177.

The spelling of 2157824425 in words is "two billion, one hundred fifty-seven million, eight hundred twenty-four thousand, four hundred twenty-five".