31637113 has 2 divisors, whose sum is σ = 31637114. Its totient is φ = 31637112.

The previous prime is 31637107. The next prime is 31637161. The reversal of 31637113 is 31173613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24730729 + 6906384 = 4973^2 + 2628^2 .

It is an emirp because it is prime and its reverse (31173613) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31637113 - 2¹³ = 31628921 is a prime.

It is not a weakly prime, because it can be changed into another prime (31037113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15818556 + 15818557.

It is an arithmetic number, because the mean of its divisors is an integer number (15818557).

Almost surely, 2^31637113 is an apocalyptic number.

It is an amenable number.

31637113 is a deficient number, since it is larger than the sum of its proper divisors (1).

31637113 is an equidigital number, since it uses as much as digits as its factorization.

31637113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134, while the sum is 25.

The square root of 31637113 is about 5624.6878135591. The cubic root of 31637113 is about 316.2755467914.

The spelling of 31637113 in words is "thirty-one million, six hundred thirty-seven thousand, one hundred thirteen".