51155729 has 2 divisors, whose sum is σ = 51155730. Its totient is φ = 51155728.

The previous prime is 51155711. The next prime is 51155743. The reversal of 51155729 is 92755115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41576704 + 9579025 = 6448^2 + 3095^2 .

It is a cyclic number.

It is not a de Polignac number, because 51155729 - 2²⁰ = 50107153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51155779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25577864 + 25577865.

It is an arithmetic number, because the mean of its divisors is an integer number (25577865).

Almost surely, 2^51155729 is an apocalyptic number.

It is an amenable number.

51155729 is a deficient number, since it is larger than the sum of its proper divisors (1).

51155729 is an equidigital number, since it uses as much as digits as its factorization.

51155729 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 51155729 is about 7152.3233288212. The cubic root of 51155729 is about 371.2200509422.

The spelling of 51155729 in words is "fifty-one million, one hundred fifty-five thousand, seven hundred twenty-nine".