215434631 has 2 divisors, whose sum is σ = 215434632. Its totient is φ = 215434630.

The previous prime is 215434621. The next prime is 215434633. The reversal of 215434631 is 136434512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215434631 - 2⁶ = 215434567 is a prime.

It is a super-2 number, since 2×215434631² = 92824160468212322, which contains 22 as substring.

Together with 215434633, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 215434594 and 215434603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215434633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107717315 + 107717316.

It is an arithmetic number, because the mean of its divisors is an integer number (107717316).

Almost surely, 2^215434631 is an apocalyptic number.

215434631 is a deficient number, since it is larger than the sum of its proper divisors (1).

215434631 is an equidigital number, since it uses as much as digits as its factorization.

215434631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 29.

The square root of 215434631 is about 14677.6916100591. The cubic root of 215434631 is about 599.4760527839.

The spelling of 215434631 in words is "two hundred fifteen million, four hundred thirty-four thousand, six hundred thirty-one".