31939069 has 2 divisors, whose sum is σ = 31939070. Its totient is φ = 31939068.

The previous prime is 31939049. The next prime is 31939091. The reversal of 31939069 is 96093913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24304900 + 7634169 = 4930^2 + 2763^2 .

It is an emirp because it is prime and its reverse (96093913) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31939069 - 2¹¹ = 31937021 is a prime.

It is a super-2 number, since 2×31939069² = 2040208257173522, which contains 22 as substring.

It is a nialpdrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31939049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15969534 + 15969535.

It is an arithmetic number, because the mean of its divisors is an integer number (15969535).

Almost surely, 2^31939069 is an apocalyptic number.

It is an amenable number.

31939069 is a deficient number, since it is larger than the sum of its proper divisors (1).

31939069 is an equidigital number, since it uses as much as digits as its factorization.

31939069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39366, while the sum is 40.

The square root of 31939069 is about 5651.4660929709. The cubic root of 31939069 is about 317.2785783359.

The spelling of 31939069 in words is "thirty-one million, nine hundred thirty-nine thousand, sixty-nine".