31838761 has 2 divisors, whose sum is σ = 31838762. Its totient is φ = 31838760.

The previous prime is 31838689. The next prime is 31838783. The reversal of 31838761 is 16783813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21566736 + 10272025 = 4644^2 + 3205^2 .

It is a cyclic number.

It is not a de Polignac number, because 31838761 - 2⁹ = 31838249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31838761.

It is not a weakly prime, because it can be changed into another prime (31838461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15919380 + 15919381.

It is an arithmetic number, because the mean of its divisors is an integer number (15919381).

Almost surely, 2^31838761 is an apocalyptic number.

It is an amenable number.

31838761 is a deficient number, since it is larger than the sum of its proper divisors (1).

31838761 is an equidigital number, since it uses as much as digits as its factorization.

31838761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 37.

The square root of 31838761 is about 5642.5846028217. The cubic root of 31838761 is about 316.9460811146.

The spelling of 31838761 in words is "thirty-one million, eight hundred thirty-eight thousand, seven hundred sixty-one".