215231025 has 12 divisors (see below), whose sum is σ = 355848752. Its totient is φ = 114789840.

The previous prime is 215230991. The next prime is 215231041. The reversal of 215231025 is 520132512.

It is not a de Polignac number, because 215231025 - 2¹⁴ = 215214641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215230992 and 215231010.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1434799 + ... + 1434948.

Almost surely, 2^215231025 is an apocalyptic number.

215231025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215231025 is a deficient number, since it is larger than the sum of its proper divisors (140617727).

215231025 is a wasteful number, since it uses less digits than its factorization.

215231025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2869760 (or 2869755 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 215231025 is about 14670.7540705991. The cubic root of 215231025 is about 599.2871394964.

Adding to 215231025 its reverse (520132512), we get a palindrome (735363537).

The spelling of 215231025 in words is "two hundred fifteen million, two hundred thirty-one thousand, twenty-five".