56178389 has 2 divisors, whose sum is σ = 56178390. Its totient is φ = 56178388.

The previous prime is 56178373. The next prime is 56178403. The reversal of 56178389 is 98387165.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56175025 + 3364 = 7495^2 + 58^2 .

It is a cyclic number.

It is not a de Polignac number, because 56178389 - 2⁴ = 56178373 is a prime.

It is a super-2 number, since 2×56178389² = 6312022781270642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56178329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28089194 + 28089195.

It is an arithmetic number, because the mean of its divisors is an integer number (28089195).

Almost surely, 2^56178389 is an apocalyptic number.

It is an amenable number.

56178389 is a deficient number, since it is larger than the sum of its proper divisors (1).

56178389 is an equidigital number, since it uses as much as digits as its factorization.

56178389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 47.

The square root of 56178389 is about 7495.2244129179. The cubic root of 56178389 is about 382.9920510454.

The spelling of 56178389 in words is "fifty-six million, one hundred seventy-eight thousand, three hundred eighty-nine".