55917689 has 2 divisors, whose sum is σ = 55917690. Its totient is φ = 55917688.

The previous prime is 55917679. The next prime is 55917691. The reversal of 55917689 is 98671955.

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., 30162064 + 25755625 = 5492^2 + 5075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55917689 is a prime.

Together with 55917691, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55917629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27958844 + 27958845.

It is an arithmetic number, because the mean of its divisors is an integer number (27958845).

Almost surely, 2^55917689 is an apocalyptic number.

It is an amenable number.

55917689 is a deficient number, since it is larger than the sum of its proper divisors (1).

55917689 is an equidigital number, since it uses as much as digits as its factorization.

55917689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 680400, while the sum is 50.

The square root of 55917689 is about 7477.8131161457. The cubic root of 55917689 is about 382.3986978803.

The spelling of 55917689 in words is "fifty-five million, nine hundred seventeen thousand, six hundred eighty-nine".