55279691 has 2 divisors, whose sum is σ = 55279692. Its totient is φ = 55279690.

The previous prime is 55279687. The next prime is 55279709. The reversal of 55279691 is 19697255.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55279691 - 2² = 55279687 is a prime.

It is not a weakly prime, because it can be changed into another prime (55275691) 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, 27639845 + 27639846.

It is an arithmetic number, because the mean of its divisors is an integer number (27639846).

Almost surely, 2^55279691 is an apocalyptic number.

55279691 is a deficient number, since it is larger than the sum of its proper divisors (1).

55279691 is an equidigital number, since it uses as much as digits as its factorization.

55279691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 170100, while the sum is 44.

The square root of 55279691 is about 7435.0313381989. The cubic root of 55279691 is about 380.9387937493.

The spelling of 55279691 in words is "fifty-five million, two hundred seventy-nine thousand, six hundred ninety-one".