31555841 has 2 divisors, whose sum is σ = 31555842. Its totient is φ = 31555840.

The previous prime is 31555813. The next prime is 31555871. The reversal of 31555841 is 14855513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25200400 + 6355441 = 5020^2 + 2521^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31555841 is a prime.

It is a super-2 number, since 2×31555841² = 1991542202434562, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 31555798 and 31555807.

It is not a weakly prime, because it can be changed into another prime (31555871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15777920 + 15777921.

It is an arithmetic number, because the mean of its divisors is an integer number (15777921).

Almost surely, 2^31555841 is an apocalyptic number.

It is an amenable number.

31555841 is a deficient number, since it is larger than the sum of its proper divisors (1).

31555841 is an equidigital number, since it uses as much as digits as its factorization.

31555841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12000, while the sum is 32.

The square root of 31555841 is about 5617.4585890774. The cubic root of 31555841 is about 316.0044897349.

The spelling of 31555841 in words is "thirty-one million, five hundred fifty-five thousand, eight hundred forty-one".