215120531 has 2 divisors, whose sum is σ = 215120532. Its totient is φ = 215120530.

The previous prime is 215120519. The next prime is 215120537. The reversal of 215120531 is 135021512.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215120531 - 2¹⁰ = 215119507 is a prime.

It is a super-2 number, since 2×215120531² = 92553685715443922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (215120537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107560265 + 107560266.

It is an arithmetic number, because the mean of its divisors is an integer number (107560266).

Almost surely, 2^215120531 is an apocalyptic number.

215120531 is a deficient number, since it is larger than the sum of its proper divisors (1).

215120531 is an equidigital number, since it uses as much as digits as its factorization.

215120531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 215120531 is about 14666.9877957268. The cubic root of 215120531 is about 599.1845691414.

The spelling of 215120531 in words is "two hundred fifteen million, one hundred twenty thousand, five hundred thirty-one".