51100729 has 2 divisors, whose sum is σ = 51100730. Its totient is φ = 51100728.

The previous prime is 51100661. The next prime is 51100757. The reversal of 51100729 is 92700115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37945600 + 13155129 = 6160^2 + 3627^2 .

It is a cyclic number.

It is not a de Polignac number, because 51100729 - 2⁷ = 51100601 is a prime.

It is a super-2 number, since 2×51100729² = 5222569008662882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51100769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25550364 + 25550365.

It is an arithmetic number, because the mean of its divisors is an integer number (25550365).

Almost surely, 2^51100729 is an apocalyptic number.

It is an amenable number.

51100729 is a deficient number, since it is larger than the sum of its proper divisors (1).

51100729 is an equidigital number, since it uses as much as digits as its factorization.

51100729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 630, while the sum is 25.

The square root of 51100729 is about 7148.4773903259. The cubic root of 51100729 is about 371.0869643540.

The spelling of 51100729 in words is "fifty-one million, one hundred thousand, seven hundred twenty-nine".