31620937 has 2 divisors, whose sum is σ = 31620938. Its totient is φ = 31620936.

The previous prime is 31620931. The next prime is 31620943. The reversal of 31620937 is 73902613.

It is a balanced prime because it is at equal distance from previous prime (31620931) and next prime (31620943).

It can be written as a sum of positive squares in only one way, i.e., 20967241 + 10653696 = 4579^2 + 3264^2 .

It is an emirp because it is prime and its reverse (73902613) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31620937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31620899 and 31620908.

It is not a weakly prime, because it can be changed into another prime (31620931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15810468 + 15810469.

It is an arithmetic number, because the mean of its divisors is an integer number (15810469).

Almost surely, 2^31620937 is an apocalyptic number.

It is an amenable number.

31620937 is a deficient number, since it is larger than the sum of its proper divisors (1).

31620937 is an equidigital number, since it uses as much as digits as its factorization.

31620937 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 31620937 is about 5623.2496832348. The cubic root of 31620937 is about 316.2216338923.

The spelling of 31620937 in words is "thirty-one million, six hundred twenty thousand, nine hundred thirty-seven".