31991741 has 2 divisors, whose sum is σ = 31991742. Its totient is φ = 31991740.

The previous prime is 31991731. The next prime is 31991759. The reversal of 31991741 is 14719913.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31967716 + 24025 = 5654^2 + 155^2 .

It is a cyclic number.

It is not a de Polignac number, because 31991741 - 2¹⁸ = 31729597 is a prime.

It is a super-2 number, since 2×31991741² = 2046942984422162, 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 (31991711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15995870 + 15995871.

It is an arithmetic number, because the mean of its divisors is an integer number (15995871).

Almost surely, 2^31991741 is an apocalyptic number.

It is an amenable number.

31991741 is a deficient number, since it is larger than the sum of its proper divisors (1).

31991741 is an equidigital number, since it uses as much as digits as its factorization.

31991741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 35.

The square root of 31991741 is about 5656.1242030210. The cubic root of 31991741 is about 317.4528948242.

The spelling of 31991741 in words is "thirty-one million, nine hundred ninety-one thousand, seven hundred forty-one".