31379629 has 2 divisors, whose sum is σ = 31379630. Its totient is φ = 31379628.

The previous prime is 31379617. The next prime is 31379633. The reversal of 31379629 is 92697313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31337604 + 42025 = 5598^2 + 205^2 .

It is an emirp because it is prime and its reverse (92697313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31379629 - 2¹⁷ = 31248557 is a prime.

It is a super-2 number, since 2×31379629² = 1969362232355282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31379591 and 31379600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31379639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15689814 + 15689815.

It is an arithmetic number, because the mean of its divisors is an integer number (15689815).

Almost surely, 2^31379629 is an apocalyptic number.

It is an amenable number.

31379629 is a deficient number, since it is larger than the sum of its proper divisors (1).

31379629 is an equidigital number, since it uses as much as digits as its factorization.

31379629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61236, while the sum is 40.

The square root of 31379629 is about 5601.7523151243. The cubic root of 31379629 is about 315.4151878004.

The spelling of 31379629 in words is "thirty-one million, three hundred seventy-nine thousand, six hundred twenty-nine".