51499697 has 2 divisors, whose sum is σ = 51499698. Its totient is φ = 51499696.

The previous prime is 51499661. The next prime is 51499727. The reversal of 51499697 is 79699415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43970161 + 7529536 = 6631^2 + 2744^2 .

It is a cyclic number.

It is not a de Polignac number, because 51499697 - 2¹⁰ = 51498673 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51499997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25749848 + 25749849.

It is an arithmetic number, because the mean of its divisors is an integer number (25749849).

Almost surely, 2^51499697 is an apocalyptic number.

It is an amenable number.

51499697 is a deficient number, since it is larger than the sum of its proper divisors (1).

51499697 is an equidigital number, since it uses as much as digits as its factorization.

51499697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 612360, while the sum is 50.

The square root of 51499697 is about 7176.3289361623. The cubic root of 51499697 is about 372.0502133821.

The spelling of 51499697 in words is "fifty-one million, four hundred ninety-nine thousand, six hundred ninety-seven".