906685991 has 2 divisors, whose sum is σ = 906685992. Its totient is φ = 906685990.

The previous prime is 906685961. The next prime is 906686021. The reversal of 906685991 is 199586609.

It is a balanced prime because it is at equal distance from previous prime (906685961) and next prime (906686021).

It is a cyclic number.

It is not a de Polignac number, because 906685991 - 2²⁶ = 839577127 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (906685961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 453342995 + 453342996.

It is an arithmetic number, because the mean of its divisors is an integer number (453342996).

Almost surely, 2^906685991 is an apocalyptic number.

906685991 is a deficient number, since it is larger than the sum of its proper divisors (1).

906685991 is an equidigital number, since it uses as much as digits as its factorization.

906685991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1049760, while the sum is 53.

The square root of 906685991 is about 30111.2269926019. The cubic root of 906685991 is about 967.8743230818.

The spelling of 906685991 in words is "nine hundred six million, six hundred eighty-five thousand, nine hundred ninety-one".