31081949 has 2 divisors, whose sum is σ = 31081950. Its totient is φ = 31081948.

The previous prime is 31081931. The next prime is 31081951. The reversal of 31081949 is 94918013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18705625 + 12376324 = 4325^2 + 3518^2 .

It is a cyclic number.

It is not a de Polignac number, because 31081949 - 2⁸ = 31081693 is a prime.

Together with 31081951, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31081969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15540974 + 15540975.

It is an arithmetic number, because the mean of its divisors is an integer number (15540975).

Almost surely, 2^31081949 is an apocalyptic number.

It is an amenable number.

31081949 is a deficient number, since it is larger than the sum of its proper divisors (1).

31081949 is an equidigital number, since it uses as much as digits as its factorization.

31081949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 31081949 is about 5575.1187431301. The cubic root of 31081949 is about 314.4146313605.

The spelling of 31081949 in words is "thirty-one million, eighty-one thousand, nine hundred forty-nine".