51297487 has 2 divisors, whose sum is σ = 51297488. Its totient is φ = 51297486.

The previous prime is 51297469. The next prime is 51297497. The reversal of 51297487 is 78479215.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51297487 - 2¹⁹ = 50773199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51297427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25648743 + 25648744.

It is an arithmetic number, because the mean of its divisors is an integer number (25648744).

Almost surely, 2^51297487 is an apocalyptic number.

51297487 is a deficient number, since it is larger than the sum of its proper divisors (1).

51297487 is an equidigital number, since it uses as much as digits as its factorization.

51297487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 43.

The square root of 51297487 is about 7162.2263996609. The cubic root of 51297487 is about 371.5626315246.

The spelling of 51297487 in words is "fifty-one million, two hundred ninety-seven thousand, four hundred eighty-seven".