51497729 has 2 divisors, whose sum is σ = 51497730. Its totient is φ = 51497728.

The previous prime is 51497723. The next prime is 51497783. The reversal of 51497729 is 92779415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46444225 + 5053504 = 6815^2 + 2248^2 .

It is a cyclic number.

It is not a de Polignac number, because 51497729 - 2²⁰ = 50449153 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51497729.

It is not a weakly prime, because it can be changed into another prime (51497723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25748864 + 25748865.

It is an arithmetic number, because the mean of its divisors is an integer number (25748865).

Almost surely, 2^51497729 is an apocalyptic number.

It is an amenable number.

51497729 is a deficient number, since it is larger than the sum of its proper divisors (1).

51497729 is an equidigital number, since it uses as much as digits as its factorization.

51497729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 158760, while the sum is 44.

The square root of 51497729 is about 7176.1918173917. The cubic root of 51497729 is about 372.0454741688.

The spelling of 51497729 in words is "fifty-one million, four hundred ninety-seven thousand, seven hundred twenty-nine".