55139719 has 2 divisors, whose sum is σ = 55139720. Its totient is φ = 55139718.

The previous prime is 55139681. The next prime is 55139723. The reversal of 55139719 is 91793155.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55139719 is a prime.

It is a super-2 number, since 2×55139719² = 6080777222797922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55139779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27569859 + 27569860.

It is an arithmetic number, because the mean of its divisors is an integer number (27569860).

Almost surely, 2^55139719 is an apocalyptic number.

55139719 is a deficient number, since it is larger than the sum of its proper divisors (1).

55139719 is an equidigital number, since it uses as much as digits as its factorization.

55139719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42525, while the sum is 40.

The square root of 55139719 is about 7425.6123653205. The cubic root of 55139719 is about 380.6170008736.

The spelling of 55139719 in words is "fifty-five million, one hundred thirty-nine thousand, seven hundred nineteen".