31849861 has 2 divisors, whose sum is σ = 31849862. Its totient is φ = 31849860.

The previous prime is 31849849. The next prime is 31849903. The reversal of 31849861 is 16894813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26061025 + 5788836 = 5105^2 + 2406^2 .

It is a cyclic number.

It is not a de Polignac number, because 31849861 - 2¹¹ = 31847813 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 (31849061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15924930 + 15924931.

It is an arithmetic number, because the mean of its divisors is an integer number (15924931).

Almost surely, 2^31849861 is an apocalyptic number.

It is an amenable number.

31849861 is a deficient number, since it is larger than the sum of its proper divisors (1).

31849861 is an equidigital number, since it uses as much as digits as its factorization.

31849861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 40.

The square root of 31849861 is about 5643.5681089183. The cubic root of 31849861 is about 316.9829093142.

The spelling of 31849861 in words is "thirty-one million, eight hundred forty-nine thousand, eight hundred sixty-one".