215213725 has 6 divisors (see below), whose sum is σ = 266865050. Its totient is φ = 172170960.

The previous prime is 215213707. The next prime is 215213759. The reversal of 215213725 is 527312512.

It can be written as a sum of positive squares in 3 ways, for example, as 13942756 + 201270969 = 3734^2 + 14187^2 .

It is not a de Polignac number, because 215213725 - 2⁷ = 215213597 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 215213693 and 215213702.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4304250 + ... + 4304299.

Almost surely, 2^215213725 is an apocalyptic number.

215213725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215213725 is a deficient number, since it is larger than the sum of its proper divisors (51651325).

215213725 is an equidigital number, since it uses as much as digits as its factorization.

215213725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8608559 (or 8608554 counting only the distinct ones).

The product of its digits is 4200, while the sum is 28.

The square root of 215213725 is about 14670.1644503393. The cubic root of 215213725 is about 599.2710824165.

The spelling of 215213725 in words is "two hundred fifteen million, two hundred thirteen thousand, seven hundred twenty-five".