31412981 has 2 divisors, whose sum is σ = 31412982. Its totient is φ = 31412980.

The previous prime is 31412977. The next prime is 31413077. The reversal of 31412981 is 18921413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23522500 + 7890481 = 4850^2 + 2809^2 .

It is a cyclic number.

It is not a de Polignac number, because 31412981 - 2² = 31412977 is a prime.

It is a super-2 number, since 2×31412981² = 1973550750612722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31412971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15706490 + 15706491.

It is an arithmetic number, because the mean of its divisors is an integer number (15706491).

Almost surely, 2^31412981 is an apocalyptic number.

It is an amenable number.

31412981 is a deficient number, since it is larger than the sum of its proper divisors (1).

31412981 is an equidigital number, since it uses as much as digits as its factorization.

31412981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 29.

The square root of 31412981 is about 5604.7284501571. The cubic root of 31412981 is about 315.5268951181.

The spelling of 31412981 in words is "thirty-one million, four hundred twelve thousand, nine hundred eighty-one".