56142781 has 2 divisors, whose sum is σ = 56142782. Its totient is φ = 56142780.

The previous prime is 56142733. The next prime is 56142803. The reversal of 56142781 is 18724165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29877156 + 26265625 = 5466^2 + 5125^2 .

It is a cyclic number.

It is not a de Polignac number, because 56142781 - 2⁹ = 56142269 is a prime.

It is a super-2 number, since 2×56142781² = 6304023716827922, which contains 22 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56142881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28071390 + 28071391.

It is an arithmetic number, because the mean of its divisors is an integer number (28071391).

Almost surely, 2^56142781 is an apocalyptic number.

It is an amenable number.

56142781 is a deficient number, since it is larger than the sum of its proper divisors (1).

56142781 is an equidigital number, since it uses as much as digits as its factorization.

56142781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 34.

The square root of 56142781 is about 7492.8486572198. The cubic root of 56142781 is about 382.9111156326.

The spelling of 56142781 in words is "fifty-six million, one hundred forty-two thousand, seven hundred eighty-one".