215832961 has 2 divisors, whose sum is σ = 215832962. Its totient is φ = 215832960.

The previous prime is 215832949. The next prime is 215833001. The reversal of 215832961 is 169238512.

215832961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156250000 + 59582961 = 12500^2 + 7719^2 .

It is a cyclic number.

It is not a de Polignac number, because 215832961 - 2¹³ = 215824769 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 215832961.

It is not a weakly prime, because it can be changed into another prime (215832931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107916480 + 107916481.

It is an arithmetic number, because the mean of its divisors is an integer number (107916481).

Almost surely, 2^215832961 is an apocalyptic number.

It is an amenable number.

215832961 is a deficient number, since it is larger than the sum of its proper divisors (1).

215832961 is an equidigital number, since it uses as much as digits as its factorization.

215832961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 37.

The square root of 215832961 is about 14691.2545754268. The cubic root of 215832961 is about 599.8452943730.

The spelling of 215832961 in words is "two hundred fifteen million, eight hundred thirty-two thousand, nine hundred sixty-one".