31064431 has 4 divisors (see below), whose sum is σ = 31227264. Its totient is φ = 30901600.

The previous prime is 31064419. The next prime is 31064437. The reversal of 31064431 is 13446013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13446013 = 7 ⋅1920859.

It is a cyclic number.

It is not a de Polignac number, because 31064431 - 2⁷ = 31064303 is a prime.

It is a super-2 number, since 2×31064431² = 1929997746707522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31064437) 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 in 3 ways as a sum of consecutive naturals, for example, 81130 + ... + 81511.

It is an arithmetic number, because the mean of its divisors is an integer number (7806816).

Almost surely, 2^31064431 is an apocalyptic number.

31064431 is a deficient number, since it is larger than the sum of its proper divisors (162833).

31064431 is a wasteful number, since it uses less digits than its factorization.

31064431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162832.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 31064431 is about 5573.5474340854. The cubic root of 31064431 is about 314.3555515111.

The spelling of 31064431 in words is "thirty-one million, sixty-four thousand, four hundred thirty-one".