55787969 has 2 divisors, whose sum is σ = 55787970. Its totient is φ = 55787968.

The previous prime is 55787957. The next prime is 55787989. The reversal of 55787969 is 96978755.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52128400 + 3659569 = 7220^2 + 1913^2 .

It is a cyclic number.

It is not a de Polignac number, because 55787969 - 2⁸ = 55787713 is a prime.

It is a super-2 number, since 2×55787969² = 6224594970289922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55787939) 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, 27893984 + 27893985.

It is an arithmetic number, because the mean of its divisors is an integer number (27893985).

Almost surely, 2^55787969 is an apocalyptic number.

It is an amenable number.

55787969 is a deficient number, since it is larger than the sum of its proper divisors (1).

55787969 is an equidigital number, since it uses as much as digits as its factorization.

55787969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4762800, while the sum is 56.

The square root of 55787969 is about 7469.1344210692. The cubic root of 55787969 is about 382.1027678694.

The spelling of 55787969 in words is "fifty-five million, seven hundred eighty-seven thousand, nine hundred sixty-nine".