31686769 has 2 divisors, whose sum is σ = 31686770. Its totient is φ = 31686768.

The previous prime is 31686761. The next prime is 31686791. The reversal of 31686769 is 96768613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30030400 + 1656369 = 5480^2 + 1287^2 .

It is a cyclic number.

It is not a de Polignac number, because 31686769 - 2³ = 31686761 is a prime.

It is a super-2 number, since 2×31686769² = 2008102659318722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31686761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15843384 + 15843385.

It is an arithmetic number, because the mean of its divisors is an integer number (15843385).

Almost surely, 2^31686769 is an apocalyptic number.

It is an amenable number.

31686769 is a deficient number, since it is larger than the sum of its proper divisors (1).

31686769 is an equidigital number, since it uses as much as digits as its factorization.

31686769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 46.

The square root of 31686769 is about 5629.1001945249. The cubic root of 31686769 is about 316.4409302882.

The spelling of 31686769 in words is "thirty-one million, six hundred eighty-six thousand, seven hundred sixty-nine".