56117531 has 2 divisors, whose sum is σ = 56117532. Its totient is φ = 56117530.

The previous prime is 56117521. The next prime is 56117549. The reversal of 56117531 is 13571165.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56117531 is a prime.

It is a super-2 number, since 2×56117531² = 6298354571071922, which contains 22 as substring.

It is a Chen prime.

It is equal to p_3344960 and since 56117531 and 3344960 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 = 56117494 and 56117503.

It is not a weakly prime, because it can be changed into another prime (56117521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28058765 + 28058766.

It is an arithmetic number, because the mean of its divisors is an integer number (28058766).

Almost surely, 2^56117531 is an apocalyptic number.

56117531 is a deficient number, since it is larger than the sum of its proper divisors (1).

56117531 is an equidigital number, since it uses as much as digits as its factorization.

56117531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3150, while the sum is 29.

The square root of 56117531 is about 7491.1635277839. The cubic root of 56117531 is about 382.8537027571.

Adding to 56117531 its reverse (13571165), we get a palindrome (69688696).

The spelling of 56117531 in words is "fifty-six million, one hundred seventeen thousand, five hundred thirty-one".