39691313 has 2 divisors, whose sum is σ = 39691314. Its totient is φ = 39691312.

The previous prime is 39691271. The next prime is 39691319. The reversal of 39691313 is 31319693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31494544 + 8196769 = 5612^2 + 2863^2 .

It is an emirp because it is prime and its reverse (31319693) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39691313 - 2²² = 35497009 is a prime.

It is not a weakly prime, because it can be changed into another prime (39691319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19845656 + 19845657.

It is an arithmetic number, because the mean of its divisors is an integer number (19845657).

Almost surely, 2^39691313 is an apocalyptic number.

It is an amenable number.

39691313 is a deficient number, since it is larger than the sum of its proper divisors (1).

39691313 is an equidigital number, since it uses as much as digits as its factorization.

39691313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13122, while the sum is 35.

The square root of 39691313 is about 6300.1042054874. The cubic root of 39691313 is about 341.1131709574.

It can be divided in two parts, 39691 and 313, that added together give a palindrome (40004).

The spelling of 39691313 in words is "thirty-nine million, six hundred ninety-one thousand, three hundred thirteen".