31132657 has 2 divisors, whose sum is σ = 31132658. Its totient is φ = 31132656.

The previous prime is 31132643. The next prime is 31132667. The reversal of 31132657 is 75623113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30924721 + 207936 = 5561^2 + 456^2 .

It is an emirp because it is prime and its reverse (75623113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31132657 - 2¹¹ = 31130609 is a prime.

It is not a weakly prime, because it can be changed into another prime (31132667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15566328 + 15566329.

It is an arithmetic number, because the mean of its divisors is an integer number (15566329).

Almost surely, 2^31132657 is an apocalyptic number.

It is an amenable number.

31132657 is a deficient number, since it is larger than the sum of its proper divisors (1).

31132657 is an equidigital number, since it uses as much as digits as its factorization.

31132657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 28.

The square root of 31132657 is about 5579.6645956545. The cubic root of 31132657 is about 314.5855202027.

The spelling of 31132657 in words is "thirty-one million, one hundred thirty-two thousand, six hundred fifty-seven".