56293981 has 2 divisors, whose sum is σ = 56293982. Its totient is φ = 56293980.

The previous prime is 56293973. The next prime is 56293997. The reversal of 56293981 is 18939265.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31741956 + 24552025 = 5634^2 + 4955^2 .

It is a cyclic number.

It is not a de Polignac number, because 56293981 - 2³ = 56293973 is a prime.

It is a super-2 number, since 2×56293981² = 6338024593656722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56293381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28146990 + 28146991.

It is an arithmetic number, because the mean of its divisors is an integer number (28146991).

Almost surely, 2^56293981 is an apocalyptic number.

It is an amenable number.

56293981 is a deficient number, since it is larger than the sum of its proper divisors (1).

56293981 is an equidigital number, since it uses as much as digits as its factorization.

56293981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 43.

The square root of 56293981 is about 7502.9314937563. The cubic root of 56293981 is about 383.2545510857.

The spelling of 56293981 in words is "fifty-six million, two hundred ninety-three thousand, nine hundred eighty-one".