55139723 has 2 divisors, whose sum is σ = 55139724. Its totient is φ = 55139722.

The previous prime is 55139719. The next prime is 55139737. The reversal of 55139723 is 32793155.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55139723 - 2² = 55139719 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (55139743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27569861 + 27569862.

It is an arithmetic number, because the mean of its divisors is an integer number (27569862).

Almost surely, 2^55139723 is an apocalyptic number.

55139723 is a deficient number, since it is larger than the sum of its proper divisors (1).

55139723 is an equidigital number, since it uses as much as digits as its factorization.

55139723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28350, while the sum is 35.

The square root of 55139723 is about 7425.6126346585. The cubic root of 55139723 is about 380.6170100773.

The spelling of 55139723 in words is "fifty-five million, one hundred thirty-nine thousand, seven hundred twenty-three".