215136025 has 24 divisors (see below), whose sum is σ = 289972760. Its totient is φ = 157386240.

The previous prime is 215136023. The next prime is 215136029. The reversal of 215136025 is 520631512.

215136025 = 10371² + 10372².

It can be written as a sum of positive squares in 12 ways, for example, as 31181056 + 183954969 = 5584^2 + 13563^2 .

It is not a de Polignac number, because 215136025 - 2¹ = 215136023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (215136023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32389 + ... + 38461.

Almost surely, 2^215136025 is an apocalyptic number.

215136025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

215136025 is the 10372-nd centered square number.

It is an amenable number.

215136025 is a deficient number, since it is larger than the sum of its proper divisors (74836735).

215136025 is a wasteful number, since it uses less digits than its factorization.

215136025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6205 (or 6200 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 215136025 is about 14667.5159791970. The cubic root of 215136025 is about 599.1989541667.

Adding to 215136025 its reverse (520631512), we get a palindrome (735767537).

The spelling of 215136025 in words is "two hundred fifteen million, one hundred thirty-six thousand, twenty-five".