215025431 has 2 divisors, whose sum is σ = 215025432. Its totient is φ = 215025430.

The previous prime is 215025409. The next prime is 215025449. The reversal of 215025431 is 134520512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215025431 is a prime.

It is a super-2 number, since 2×215025431² = 92471871953471522, 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 = 215025397 and 215025406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215025631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107512715 + 107512716.

It is an arithmetic number, because the mean of its divisors is an integer number (107512716).

Almost surely, 2^215025431 is an apocalyptic number.

215025431 is a deficient number, since it is larger than the sum of its proper divisors (1).

215025431 is an equidigital number, since it uses as much as digits as its factorization.

215025431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 215025431 is about 14663.7454628754. The cubic root of 215025431 is about 599.0962607387.

Adding to 215025431 its reverse (134520512), we get a palindrome (349545943).

The spelling of 215025431 in words is "two hundred fifteen million, twenty-five thousand, four hundred thirty-one".