31660523 has 4 divisors (see below), whose sum is σ = 31744440. Its totient is φ = 31576608.

The previous prime is 31660507. The next prime is 31660537. The reversal of 31660523 is 32506613.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31660523 - 2⁴ = 31660507 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31660492 and 31660501.

It is not an unprimeable number, because it can be changed into a prime (31660543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41390 + ... + 42147.

It is an arithmetic number, because the mean of its divisors is an integer number (7936110).

Almost surely, 2^31660523 is an apocalyptic number.

31660523 is a deficient number, since it is larger than the sum of its proper divisors (83917).

31660523 is an equidigital number, since it uses as much as digits as its factorization.

31660523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83916.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 31660523 is about 5626.7684331239. The cubic root of 31660523 is about 316.3535373157.

The spelling of 31660523 in words is "thirty-one million, six hundred sixty thousand, five hundred twenty-three".