31325869 has 2 divisors, whose sum is σ = 31325870. Its totient is φ = 31325868.

The previous prime is 31325867. The next prime is 31325881. The reversal of 31325869 is 96852313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29975625 + 1350244 = 5475^2 + 1162^2 .

It is a cyclic number.

It is not a de Polignac number, because 31325869 - 2¹ = 31325867 is a prime.

It is a super-2 number, since 2×31325869² = 1962620137210322, which contains 22 as substring.

Together with 31325867, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31325867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15662934 + 15662935.

It is an arithmetic number, because the mean of its divisors is an integer number (15662935).

Almost surely, 2^31325869 is an apocalyptic number.

It is an amenable number.

31325869 is a deficient number, since it is larger than the sum of its proper divisors (1).

31325869 is an equidigital number, since it uses as much as digits as its factorization.

31325869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 37.

The square root of 31325869 is about 5596.9517596635. The cubic root of 31325869 is about 315.2349603326.

The spelling of 31325869 in words is "thirty-one million, three hundred twenty-five thousand, eight hundred sixty-nine".