31154689 has 2 divisors, whose sum is σ = 31154690. Its totient is φ = 31154688.

The previous prime is 31154687. The next prime is 31154741. The reversal of 31154689 is 98645113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28569025 + 2585664 = 5345^2 + 1608^2 .

It is a cyclic number.

It is not a de Polignac number, because 31154689 - 2¹ = 31154687 is a prime.

It is a super-2 number, since 2×31154689² = 1941229293373442, which contains 22 as substring.

Together with 31154687, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31154687) 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, 15577344 + 15577345.

It is an arithmetic number, because the mean of its divisors is an integer number (15577345).

Almost surely, 2^31154689 is an apocalyptic number.

It is an amenable number.

31154689 is a deficient number, since it is larger than the sum of its proper divisors (1).

31154689 is an equidigital number, since it uses as much as digits as its factorization.

31154689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 37.

The square root of 31154689 is about 5581.6385587030. The cubic root of 31154689 is about 314.6597114703.

The spelling of 31154689 in words is "thirty-one million, one hundred fifty-four thousand, six hundred eighty-nine".