908031997 has 4 divisors (see below), whose sum is σ = 912737020. Its totient is φ = 903326976.

The previous prime is 908031979. The next prime is 908032001. The reversal of 908031997 is 799130809.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 799130809 = 163 ⋅4902643.

It can be written as a sum of positive squares in 2 ways, for example, as 434055556 + 473976441 = 20834^2 + 21771^2 .

It is a cyclic number.

It is not a de Polignac number, because 908031997 - 2²⁷ = 773814269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (908031937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2352222 + ... + 2352607.

It is an arithmetic number, because the mean of its divisors is an integer number (228184255).

Almost surely, 2^908031997 is an apocalyptic number.

It is an amenable number.

908031997 is a deficient number, since it is larger than the sum of its proper divisors (4705023).

908031997 is a wasteful number, since it uses less digits than its factorization.

908031997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4705022.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 908031997 is about 30133.5692708315. The cubic root of 908031997 is about 968.3530336549.

The spelling of 908031997 in words is "nine hundred eight million, thirty-one thousand, nine hundred ninety-seven".