31013661 has 32 divisors (see below), whose sum is σ = 50561280. Its totient is φ = 16505856.

The previous prime is 31013611. The next prime is 31013669. The reversal of 31013661 is 16631013.

It is not a de Polignac number, because 31013661 - 2¹⁴ = 30997277 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31013669) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38515 + ... + 39311.

It is an arithmetic number, because the mean of its divisors is an integer number (1580040).

Almost surely, 2^31013661 is an apocalyptic number.

It is an amenable number.

31013661 is a deficient number, since it is larger than the sum of its proper divisors (19547619).

31013661 is a wasteful number, since it uses less digits than its factorization.

31013661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 31013661 is about 5568.9910217202. The cubic root of 31013661 is about 314.1842029798.

Adding to 31013661 its reverse (16631013), we get a palindrome (47644674).

The spelling of 31013661 in words is "thirty-one million, thirteen thousand, six hundred sixty-one".