55158239 has 2 divisors, whose sum is σ = 55158240. Its totient is φ = 55158238.

The previous prime is 55158211. The next prime is 55158247. The reversal of 55158239 is 93285155.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55158239 - 2¹⁶ = 55092703 is a prime.

It is a super-2 number, since 2×55158239² = 6084862659162242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55158739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27579119 + 27579120.

It is an arithmetic number, because the mean of its divisors is an integer number (27579120).

Almost surely, 2^55158239 is an apocalyptic number.

55158239 is a deficient number, since it is larger than the sum of its proper divisors (1).

55158239 is an equidigital number, since it uses as much as digits as its factorization.

55158239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54000, while the sum is 38.

The square root of 55158239 is about 7426.8592958262. The cubic root of 55158239 is about 380.6596092264.

The spelling of 55158239 in words is "fifty-five million, one hundred fifty-eight thousand, two hundred thirty-nine".