55235639 has 2 divisors, whose sum is σ = 55235640. Its totient is φ = 55235638.

The previous prime is 55235617. The next prime is 55235689. The reversal of 55235639 is 93653255.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55235639 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55235689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27617819 + 27617820.

It is an arithmetic number, because the mean of its divisors is an integer number (27617820).

Almost surely, 2^55235639 is an apocalyptic number.

55235639 is a deficient number, since it is larger than the sum of its proper divisors (1).

55235639 is an equidigital number, since it uses as much as digits as its factorization.

55235639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 121500, while the sum is 38.

The square root of 55235639 is about 7432.0682854775. The cubic root of 55235639 is about 380.8375777029.

The spelling of 55235639 in words is "fifty-five million, two hundred thirty-five thousand, six hundred thirty-nine".