215131069 has 2 divisors, whose sum is σ = 215131070. Its totient is φ = 215131068.

The previous prime is 215131057. The next prime is 215131093. The reversal of 215131069 is 960131512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180768025 + 34363044 = 13445^2 + 5862^2 .

It is a cyclic number.

It is not a de Polignac number, because 215131069 - 2²⁷ = 80913341 is a prime.

It is a super-2 number, since 2×215131069² = 92562753698165522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215131669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107565534 + 107565535.

It is an arithmetic number, because the mean of its divisors is an integer number (107565535).

Almost surely, 2^215131069 is an apocalyptic number.

It is an amenable number.

215131069 is a deficient number, since it is larger than the sum of its proper divisors (1).

215131069 is an equidigital number, since it uses as much as digits as its factorization.

215131069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 215131069 is about 14667.3470334618. The cubic root of 215131069 is about 599.1943529649.

The spelling of 215131069 in words is "two hundred fifteen million, one hundred thirty-one thousand, sixty-nine".