55115729 has 2 divisors, whose sum is σ = 55115730. Its totient is φ = 55115728.

The previous prime is 55115701. The next prime is 55115743. The reversal of 55115729 is 92751155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49000000 + 6115729 = 7000^2 + 2473^2 .

It is a cyclic number.

It is not a de Polignac number, because 55115729 - 2²⁴ = 38338513 is a prime.

It is not a weakly prime, because it can be changed into another prime (55115129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27557864 + 27557865.

It is an arithmetic number, because the mean of its divisors is an integer number (27557865).

Almost surely, 2^55115729 is an apocalyptic number.

It is an amenable number.

55115729 is a deficient number, since it is larger than the sum of its proper divisors (1).

55115729 is an equidigital number, since it uses as much as digits as its factorization.

55115729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15750, while the sum is 35.

The square root of 55115729 is about 7423.9968345898. The cubic root of 55115729 is about 380.5617936862.

The spelling of 55115729 in words is "fifty-five million, one hundred fifteen thousand, seven hundred twenty-nine".