215156249 has 16 divisors (see below), whose sum is σ = 277499520. Its totient is φ = 161871360.

The previous prime is 215156189. The next prime is 215156269. The reversal of 215156249 is 942651512.

It is a happy number.

It is not a de Polignac number, because 215156249 - 2¹⁶ = 215090713 is a prime.

It is a super-2 number, since 2×215156249² = 92584422967500002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215156269) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45944 + ... + 50409.

It is an arithmetic number, because the mean of its divisors is an integer number (17343720).

Almost surely, 2^215156249 is an apocalyptic number.

215156249 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

215156249 is a deficient number, since it is larger than the sum of its proper divisors (62343271).

215156249 is a wasteful number, since it uses less digits than its factorization.

215156249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96400.

The product of its digits is 21600, while the sum is 35.

The square root of 215156249 is about 14668.2053776186. The cubic root of 215156249 is about 599.2177296057.

The spelling of 215156249 in words is "two hundred fifteen million, one hundred fifty-six thousand, two hundred forty-nine".