215425631 has 2 divisors, whose sum is σ = 215425632. Its totient is φ = 215425630.

The previous prime is 215425537. The next prime is 215425643. The reversal of 215425631 is 136524512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215425631 - 2¹⁰ = 215424607 is a prime.

It is a super-2 number, since 2×215425631² = 92816404983496322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 215425594 and 215425603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215425681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107712815 + 107712816.

It is an arithmetic number, because the mean of its divisors is an integer number (107712816).

Almost surely, 2^215425631 is an apocalyptic number.

215425631 is a deficient number, since it is larger than the sum of its proper divisors (1).

215425631 is an equidigital number, since it uses as much as digits as its factorization.

215425631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 29.

The square root of 215425631 is about 14677.3850191374. The cubic root of 215425631 is about 599.4677047611.

The spelling of 215425631 in words is "two hundred fifteen million, four hundred twenty-five thousand, six hundred thirty-one".