55242919 has 2 divisors, whose sum is σ = 55242920. Its totient is φ = 55242918.

The previous prime is 55242871. The next prime is 55242931. The reversal of 55242919 is 91924255.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55242919 - 2⁷ = 55242791 is a prime.

It is a super-2 number, since 2×55242919² = 6103560199281122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55242959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27621459 + 27621460.

It is an arithmetic number, because the mean of its divisors is an integer number (27621460).

Almost surely, 2^55242919 is an apocalyptic number.

55242919 is a deficient number, since it is larger than the sum of its proper divisors (1).

55242919 is an equidigital number, since it uses as much as digits as its factorization.

55242919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 37.

The square root of 55242919 is about 7432.5580387912. The cubic root of 55242919 is about 380.8543083007.

The spelling of 55242919 in words is "fifty-five million, two hundred forty-two thousand, nine hundred nineteen".