55609139 has 2 divisors, whose sum is σ = 55609140. Its totient is φ = 55609138.

The previous prime is 55609123. The next prime is 55609171. The reversal of 55609139 is 93190655.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55609139 - 2⁴ = 55609123 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55609189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27804569 + 27804570.

It is an arithmetic number, because the mean of its divisors is an integer number (27804570).

Almost surely, 2^55609139 is an apocalyptic number.

55609139 is a deficient number, since it is larger than the sum of its proper divisors (1).

55609139 is an equidigital number, since it uses as much as digits as its factorization.

55609139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36450, while the sum is 38.

The square root of 55609139 is about 7457.1535454220. The cubic root of 55609139 is about 381.6940502294.

The spelling of 55609139 in words is "fifty-five million, six hundred nine thousand, one hundred thirty-nine".