56121761 has 4 divisors (see below), whose sum is σ = 56677524. Its totient is φ = 55566000.

The previous prime is 56121733. The next prime is 56121773. The reversal of 56121761 is 16712165.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42981136 + 13140625 = 6556^2 + 3625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56121761 is a prime.

It is a super-2 number, since 2×56121761² = 6299304115482242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56121731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 277730 + ... + 277931.

It is an arithmetic number, because the mean of its divisors is an integer number (14169381).

Almost surely, 2^56121761 is an apocalyptic number.

It is an amenable number.

56121761 is a deficient number, since it is larger than the sum of its proper divisors (555763).

56121761 is a wasteful number, since it uses less digits than its factorization.

56121761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555762.

The product of its digits is 2520, while the sum is 29.

The square root of 56121761 is about 7491.4458551070. The cubic root of 56121761 is about 382.8633220356.

It can be divided in two parts, 561 and 21761, that added together give a palindrome (22322).

The spelling of 56121761 in words is "fifty-six million, one hundred twenty-one thousand, seven hundred sixty-one".