31673861 has 2 divisors, whose sum is σ = 31673862. Its totient is φ = 31673860.

The previous prime is 31673833. The next prime is 31673869. The reversal of 31673861 is 16837613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31192225 + 481636 = 5585^2 + 694^2 .

It is a cyclic number.

It is not a de Polignac number, because 31673861 - 2⁶ = 31673797 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_1954916 and since 31673861 and 1954916 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31673869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15836930 + 15836931.

It is an arithmetic number, because the mean of its divisors is an integer number (15836931).

Almost surely, 2^31673861 is an apocalyptic number.

It is an amenable number.

31673861 is a deficient number, since it is larger than the sum of its proper divisors (1).

31673861 is an equidigital number, since it uses as much as digits as its factorization.

31673861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 31673861 is about 5627.9535357002. The cubic root of 31673861 is about 316.3979557342.

The spelling of 31673861 in words is "thirty-one million, six hundred seventy-three thousand, eight hundred sixty-one".