31196561 has 8 divisors (see below), whose sum is σ = 34196448. Its totient is φ = 28224000.

The previous prime is 31196551. The next prime is 31196569. The reversal of 31196561 is 16569113.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 31196561 - 2⁶ = 31196497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31196569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4400 + ... + 9041.

It is an arithmetic number, because the mean of its divisors is an integer number (4274556).

Almost surely, 2^31196561 is an apocalyptic number.

It is an amenable number.

31196561 is a deficient number, since it is larger than the sum of its proper divisors (2999887).

31196561 is a wasteful number, since it uses less digits than its factorization.

31196561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13663.

The product of its digits is 4860, while the sum is 32.

The square root of 31196561 is about 5585.3881691428. The cubic root of 31196561 is about 314.8006162443.

The spelling of 31196561 in words is "thirty-one million, one hundred ninety-six thousand, five hundred sixty-one".