855407131 has 2 divisors, whose sum is σ = 855407132. Its totient is φ = 855407130.

The previous prime is 855407123. The next prime is 855407141. The reversal of 855407131 is 131704558.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 855407131 - 2³ = 855407123 is a prime.

It is a super-2 number, since 2×855407131² = 1463442719531302322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (855407101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427703565 + 427703566.

It is an arithmetic number, because the mean of its divisors is an integer number (427703566).

Almost surely, 2^855407131 is an apocalyptic number.

855407131 is a deficient number, since it is larger than the sum of its proper divisors (1).

855407131 is an equidigital number, since it uses as much as digits as its factorization.

855407131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 855407131 is about 29247.3439990711. The cubic root of 855407131 is about 949.2726217948.

The spelling of 855407131 in words is "eight hundred fifty-five million, four hundred seven thousand, one hundred thirty-one".