215268731 has 2 divisors, whose sum is σ = 215268732. Its totient is φ = 215268730.

The previous prime is 215268709. The next prime is 215268811. The reversal of 215268731 is 137862512.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215268731 - 2¹⁸ = 215006587 is a prime.

It is a super-2 number, since 2×215268731² = 92681253092700722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 215268691 and 215268700.

It is not a weakly prime, because it can be changed into another prime (215268631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107634365 + 107634366.

It is an arithmetic number, because the mean of its divisors is an integer number (107634366).

Almost surely, 2^215268731 is an apocalyptic number.

215268731 is a deficient number, since it is larger than the sum of its proper divisors (1).

215268731 is an equidigital number, since it uses as much as digits as its factorization.

215268731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 35.

The square root of 215268731 is about 14672.0390880068. The cubic root of 215268731 is about 599.3221335242.

The spelling of 215268731 in words is "two hundred fifteen million, two hundred sixty-eight thousand, seven hundred thirty-one".