54891569 has 2 divisors, whose sum is σ = 54891570. Its totient is φ = 54891568.

The previous prime is 54891533. The next prime is 54891587. The reversal of 54891569 is 96519845.

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., 33500944 + 21390625 = 5788^2 + 4625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54891569 is a prime.

It is a super-2 number, since 2×54891569² = 6026168694563522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (54891509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27445784 + 27445785.

It is an arithmetic number, because the mean of its divisors is an integer number (27445785).

Almost surely, 2^54891569 is an apocalyptic number.

It is an amenable number.

54891569 is a deficient number, since it is larger than the sum of its proper divisors (1).

54891569 is an equidigital number, since it uses as much as digits as its factorization.

54891569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 388800, while the sum is 47.

The square root of 54891569 is about 7408.8844639392. The cubic root of 54891569 is about 380.0451677612.

The spelling of 54891569 in words is "fifty-four million, eight hundred ninety-one thousand, five hundred sixty-nine".