215340031 has 2 divisors, whose sum is σ = 215340032. Its totient is φ = 215340030.

The previous prime is 215340019. The next prime is 215340067. The reversal of 215340031 is 130043512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215340031 - 2¹⁵ = 215307263 is a prime.

It is a super-2 number, since 2×215340031² = 92742657902161922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 215339990 and 215340008.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215340731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107670015 + 107670016.

It is an arithmetic number, because the mean of its divisors is an integer number (107670016).

Almost surely, 2^215340031 is an apocalyptic number.

215340031 is a deficient number, since it is larger than the sum of its proper divisors (1).

215340031 is an equidigital number, since it uses as much as digits as its factorization.

215340031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 215340031 is about 14674.4686786268. The cubic root of 215340031 is about 599.3882941645.

Adding to 215340031 its reverse (130043512), we get a palindrome (345383543).

The spelling of 215340031 in words is "two hundred fifteen million, three hundred forty thousand, thirty-one".