56121231 has 8 divisors (see below), whose sum is σ = 78766720. Its totient is φ = 35444952.

The previous prime is 56121229. The next prime is 56121239. The reversal of 56121231 is 13212165.

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

It is not a de Polignac number, because 56121231 - 2¹ = 56121229 is a prime.

It is a super-2 number, since 2×56121231² = 6299185137910722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 56121198 and 56121207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56121239) 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, 492235 + ... + 492348.

It is an arithmetic number, because the mean of its divisors is an integer number (9845840).

Almost surely, 2^56121231 is an apocalyptic number.

56121231 is a deficient number, since it is larger than the sum of its proper divisors (22645489).

56121231 is a wasteful number, since it uses less digits than its factorization.

56121231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 984605.

The product of its digits is 360, while the sum is 21.

The square root of 56121231 is about 7491.4104813446. The cubic root of 56121231 is about 382.8621168097.

Adding to 56121231 its reverse (13212165), we get a palindrome (69333396).

The spelling of 56121231 in words is "fifty-six million, one hundred twenty-one thousand, two hundred thirty-one".