56127781 has 2 divisors, whose sum is σ = 56127782. Its totient is φ = 56127780.

The previous prime is 56127769. The next prime is 56127787. The reversal of 56127781 is 18772165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42185025 + 13942756 = 6495^2 + 3734^2 .

It is a cyclic number.

It is not a de Polignac number, because 56127781 - 2⁵ = 56127749 is a prime.

It is a super-2 number, since 2×56127781² = 6300655599967922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 56127781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56127787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28063890 + 28063891.

It is an arithmetic number, because the mean of its divisors is an integer number (28063891).

Almost surely, 2^56127781 is an apocalyptic number.

It is an amenable number.

56127781 is a deficient number, since it is larger than the sum of its proper divisors (1).

56127781 is an equidigital number, since it uses as much as digits as its factorization.

56127781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23520, while the sum is 37.

The square root of 56127781 is about 7491.8476359307. The cubic root of 56127781 is about 382.8770110501.

The spelling of 56127781 in words is "fifty-six million, one hundred twenty-seven thousand, seven hundred eighty-one".