31629613 has 2 divisors, whose sum is σ = 31629614. Its totient is φ = 31629612.

The previous prime is 31629607. The next prime is 31629617. The reversal of 31629613 is 31692613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30713764 + 915849 = 5542^2 + 957^2 .

It is an emirp because it is prime and its reverse (31692613) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31629613 - 2¹⁷ = 31498541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31629617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15814806 + 15814807.

It is an arithmetic number, because the mean of its divisors is an integer number (15814807).

Almost surely, 2^31629613 is an apocalyptic number.

It is an amenable number.

31629613 is a deficient number, since it is larger than the sum of its proper divisors (1).

31629613 is an equidigital number, since it uses as much as digits as its factorization.

31629613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 31.

The square root of 31629613 is about 5624.0210703730. The cubic root of 31629613 is about 316.2505523693.

It can be divided in two parts, 316 and 29613, that added together give a square (29929 = 173²).

The spelling of 31629613 in words is "thirty-one million, six hundred twenty-nine thousand, six hundred thirteen".