31416881 has 2 divisors, whose sum is σ = 31416882. Its totient is φ = 31416880.

The previous prime is 31416871. The next prime is 31416887. The reversal of 31416881 is 18861413.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17098225 + 14318656 = 4135^2 + 3784^2 .

It is a cyclic number.

It is not a de Polignac number, because 31416881 - 2⁶ = 31416817 is a prime.

It is a super-2 number, since 2×31416881² = 1974040823536322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31416887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15708440 + 15708441.

It is an arithmetic number, because the mean of its divisors is an integer number (15708441).

Almost surely, 2^31416881 is an apocalyptic number.

It is an amenable number.

31416881 is a deficient number, since it is larger than the sum of its proper divisors (1).

31416881 is an equidigital number, since it uses as much as digits as its factorization.

31416881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 32.

The square root of 31416881 is about 5605.0763598724. The cubic root of 31416881 is about 315.5399523949.

The spelling of 31416881 in words is "thirty-one million, four hundred sixteen thousand, eight hundred eighty-one".