31368561 has 8 divisors (see below), whose sum is σ = 47799744. Its totient is φ = 17924880.

The previous prime is 31368551. The next prime is 31368577. The reversal of 31368561 is 16586313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31368561 - 2⁷ = 31368433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31368551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 746850 + ... + 746891.

It is an arithmetic number, because the mean of its divisors is an integer number (5974968).

Almost surely, 2^31368561 is an apocalyptic number.

It is an amenable number.

31368561 is a deficient number, since it is larger than the sum of its proper divisors (16431183).

31368561 is a wasteful number, since it uses less digits than its factorization.

31368561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1493751.

The product of its digits is 12960, while the sum is 33.

The square root of 31368561 is about 5600.7643228402. The cubic root of 31368561 is about 315.3780997708.

The spelling of 31368561 in words is "thirty-one million, three hundred sixty-eight thousand, five hundred sixty-one".