51243497 has 2 divisors, whose sum is σ = 51243498. Its totient is φ = 51243496.

The previous prime is 51243473. The next prime is 51243499. The reversal of 51243497 is 79434215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49224256 + 2019241 = 7016^2 + 1421^2 .

It is a cyclic number.

It is not a de Polignac number, because 51243497 - 2⁶ = 51243433 is a prime.

Together with 51243499, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51243499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25621748 + 25621749.

It is an arithmetic number, because the mean of its divisors is an integer number (25621749).

Almost surely, 2^51243497 is an apocalyptic number.

It is an amenable number.

51243497 is a deficient number, since it is larger than the sum of its proper divisors (1).

51243497 is an equidigital number, since it uses as much as digits as its factorization.

51243497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 35.

The square root of 51243497 is about 7158.4563280082. The cubic root of 51243497 is about 371.4322306698.

The spelling of 51243497 in words is "fifty-one million, two hundred forty-three thousand, four hundred ninety-seven".