55142239 has 2 divisors, whose sum is σ = 55142240. Its totient is φ = 55142238.

The previous prime is 55142189. The next prime is 55142251. The reversal of 55142239 is 93224155.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55142239 - 2¹¹ = 55140191 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55142239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55152239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27571119 + 27571120.

It is an arithmetic number, because the mean of its divisors is an integer number (27571120).

Almost surely, 2^55142239 is an apocalyptic number.

55142239 is a deficient number, since it is larger than the sum of its proper divisors (1).

55142239 is an equidigital number, since it uses as much as digits as its factorization.

55142239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 31.

The square root of 55142239 is about 7425.7820463571. The cubic root of 55142239 is about 380.6227991151.

The spelling of 55142239 in words is "fifty-five million, one hundred forty-two thousand, two hundred thirty-nine".