51499997 has 2 divisors, whose sum is σ = 51499998. Its totient is φ = 51499996.

The previous prime is 51499963. The next prime is 51499999. The reversal of 51499997 is 79999415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31483321 + 20016676 = 5611^2 + 4474^2 .

It is a cyclic number.

It is not a de Polignac number, because 51499997 - 2⁶ = 51499933 is a prime.

Together with 51499999, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51499999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25749998 + 25749999.

It is an arithmetic number, because the mean of its divisors is an integer number (25749999).

Almost surely, 2^51499997 is an apocalyptic number.

It is an amenable number.

51499997 is a deficient number, since it is larger than the sum of its proper divisors (1).

51499997 is an equidigital number, since it uses as much as digits as its factorization.

51499997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 918540, while the sum is 53.

The square root of 51499997 is about 7176.3498381838. The cubic root of 51499997 is about 372.0509358126.

The spelling of 51499997 in words is "fifty-one million, four hundred ninety-nine thousand, nine hundred ninety-seven".