31748661 has 12 divisors (see below), whose sum is σ = 52410592. Its totient is φ = 18142056.

The previous prime is 31748653. The next prime is 31748669. The reversal of 31748661 is 16684713.

It is an interprime number because it is at equal distance from previous prime (31748653) and next prime (31748669).

It is not a de Polignac number, because 31748661 - 2³ = 31748653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31748669) 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 11 ways as a sum of consecutive naturals, for example, 251911 + ... + 252036.

Almost surely, 2^31748661 is an apocalyptic number.

It is an amenable number.

31748661 is a deficient number, since it is larger than the sum of its proper divisors (20661931).

31748661 is a wasteful number, since it uses less digits than its factorization.

31748661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503960 (or 503957 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 31748661 is about 5634.5950165030. The cubic root of 31748661 is about 316.6468251034.

The spelling of 31748661 in words is "thirty-one million, seven hundred forty-eight thousand, six hundred sixty-one".