215902901 has 2 divisors, whose sum is σ = 215902902. Its totient is φ = 215902900.

The previous prime is 215902859. The next prime is 215902931. The reversal of 215902901 is 109209512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191794801 + 24108100 = 13849^2 + 4910^2 .

It is a cyclic number.

It is not a de Polignac number, because 215902901 - 2²² = 211708597 is a prime.

It is a super-2 number, since 2×215902901² = 93228125320431602, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215902931) by changing a digit.

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 as a sum of consecutive naturals, namely, 107951450 + 107951451.

It is an arithmetic number, because the mean of its divisors is an integer number (107951451).

Almost surely, 2^215902901 is an apocalyptic number.

It is an amenable number.

215902901 is a deficient number, since it is larger than the sum of its proper divisors (1).

215902901 is an equidigital number, since it uses as much as digits as its factorization.

215902901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 215902901 is about 14693.6347103091. The cubic root of 215902901 is about 599.9100800432.

The spelling of 215902901 in words is "two hundred fifteen million, nine hundred two thousand, nine hundred one".