55681369 has 2 divisors, whose sum is σ = 55681370. Its totient is φ = 55681368.

The previous prime is 55681361. The next prime is 55681387. The reversal of 55681369 is 96318655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49491225 + 6190144 = 7035^2 + 2488^2 .

It is a cyclic number.

It is not a de Polignac number, because 55681369 - 2³ = 55681361 is a prime.

It is a super-2 number, since 2×55681369² = 6200829707428322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55681361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27840684 + 27840685.

It is an arithmetic number, because the mean of its divisors is an integer number (27840685).

Almost surely, 2^55681369 is an apocalyptic number.

It is an amenable number.

55681369 is a deficient number, since it is larger than the sum of its proper divisors (1).

55681369 is an equidigital number, since it uses as much as digits as its factorization.

55681369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 43.

The square root of 55681369 is about 7461.9949745360. The cubic root of 55681369 is about 381.8592379046.

The spelling of 55681369 in words is "fifty-five million, six hundred eighty-one thousand, three hundred sixty-nine".