55452139 has 2 divisors, whose sum is σ = 55452140. Its totient is φ = 55452138.

The previous prime is 55452109. The next prime is 55452157. The reversal of 55452139 is 93125455.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55452139 is a prime.

It is not a weakly prime, because it can be changed into another prime (55452109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27726069 + 27726070.

It is an arithmetic number, because the mean of its divisors is an integer number (27726070).

Almost surely, 2^55452139 is an apocalyptic number.

55452139 is a deficient number, since it is larger than the sum of its proper divisors (1).

55452139 is an equidigital number, since it uses as much as digits as its factorization.

55452139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27000, while the sum is 34.

The square root of 55452139 is about 7446.6193000582. The cubic root of 55452139 is about 381.3345023118.

The spelling of 55452139 in words is "fifty-five million, four hundred fifty-two thousand, one hundred thirty-nine".