55193939 has 2 divisors, whose sum is σ = 55193940. Its totient is φ = 55193938.

The previous prime is 55193927. The next prime is 55193987. The reversal of 55193939 is 93939155.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55193939 - 2⁴ = 55193923 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55193939.

It is not a weakly prime, because it can be changed into another prime (55195939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27596969 + 27596970.

It is an arithmetic number, because the mean of its divisors is an integer number (27596970).

Almost surely, 2^55193939 is an apocalyptic number.

55193939 is a deficient number, since it is larger than the sum of its proper divisors (1).

55193939 is an equidigital number, since it uses as much as digits as its factorization.

55193939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 164025, while the sum is 44.

The square root of 55193939 is about 7429.2623456168. The cubic root of 55193939 is about 380.7417161337.

The spelling of 55193939 in words is "fifty-five million, one hundred ninety-three thousand, nine hundred thirty-nine".