31137133 has 2 divisors, whose sum is σ = 31137134. Its totient is φ = 31137132.

The previous prime is 31137131. The next prime is 31137137. The reversal of 31137133 is 33173113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29452329 + 1684804 = 5427^2 + 1298^2 .

It is an emirp because it is prime and its reverse (33173113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31137133 - 2¹ = 31137131 is a prime.

Together with 31137131, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31137131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15568566 + 15568567.

It is an arithmetic number, because the mean of its divisors is an integer number (15568567).

Almost surely, 2^31137133 is an apocalyptic number.

It is an amenable number.

31137133 is a deficient number, since it is larger than the sum of its proper divisors (1).

31137133 is an equidigital number, since it uses as much as digits as its factorization.

31137133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 567, while the sum is 22.

The square root of 31137133 is about 5580.0656806170. The cubic root of 31137133 is about 314.6005956620.

The spelling of 31137133 in words is "thirty-one million, one hundred thirty-seven thousand, one hundred thirty-three".