31319669 has 2 divisors, whose sum is σ = 31319670. Its totient is φ = 31319668.

The previous prime is 31319663. The next prime is 31319677. The reversal of 31319669 is 96691313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17960644 + 13359025 = 4238^2 + 3655^2 .

It is an emirp because it is prime and its reverse (96691313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31319669 - 2⁴ = 31319653 is a prime.

It is a super-2 number, since 2×31319669² = 1961843332539122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31319663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15659834 + 15659835.

It is an arithmetic number, because the mean of its divisors is an integer number (15659835).

Almost surely, 2^31319669 is an apocalyptic number.

It is an amenable number.

31319669 is a deficient number, since it is larger than the sum of its proper divisors (1).

31319669 is an equidigital number, since it uses as much as digits as its factorization.

31319669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26244, while the sum is 38.

The square root of 31319669 is about 5596.3978593377. The cubic root of 31319669 is about 315.2141619130.

The spelling of 31319669 in words is "thirty-one million, three hundred nineteen thousand, six hundred sixty-nine".