56611231 has 2 divisors, whose sum is σ = 56611232. Its totient is φ = 56611230.

The previous prime is 56611223. The next prime is 56611249. The reversal of 56611231 is 13211665.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56611231 - 2³ = 56611223 is a prime.

It is a super-2 number, since 2×56611231² = 6409662950670722, which contains 22 as substring.

It is equal to p_3372604 and since 56611231 and 3372604 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 56611196 and 56611205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56614231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28305615 + 28305616.

It is an arithmetic number, because the mean of its divisors is an integer number (28305616).

Almost surely, 2^56611231 is an apocalyptic number.

56611231 is a deficient number, since it is larger than the sum of its proper divisors (1).

56611231 is an equidigital number, since it uses as much as digits as its factorization.

56611231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 25.

The square root of 56611231 is about 7524.0435272531. The cubic root of 56611231 is about 383.9731584790.

Adding to 56611231 its reverse (13211665), we get a palindrome (69822896).

The spelling of 56611231 in words is "fifty-six million, six hundred eleven thousand, two hundred thirty-one".