667431531 has 36 divisors (see below), whose sum is σ = 1051879608. Its totient is φ = 407601792.

The previous prime is 667431511. The next prime is 667431547. The reversal of 667431531 is 135134766.

667431531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 667431531 - 2¹⁹ = 666907243 is a prime.

It is a super-2 number, since 2×667431531² = 890929697146007922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (667431511) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 206776 + ... + 209978.

It is an arithmetic number, because the mean of its divisors is an integer number (29218878).

Almost surely, 2^667431531 is an apocalyptic number.

667431531 is a deficient number, since it is larger than the sum of its proper divisors (384448077).

667431531 is a wasteful number, since it uses less digits than its factorization.

667431531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3372 (or 3356 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 667431531 is about 25834.6962629716. The cubic root of 667431531 is about 873.9144223226.

The spelling of 667431531 in words is "six hundred sixty-seven million, four hundred thirty-one thousand, five hundred thirty-one".