51486791 has 2 divisors, whose sum is σ = 51486792. Its totient is φ = 51486790.

The previous prime is 51486779. The next prime is 51486817. The reversal of 51486791 is 19768415.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51486791 - 2¹⁰ = 51485767 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51486091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25743395 + 25743396.

It is an arithmetic number, because the mean of its divisors is an integer number (25743396).

Almost surely, 2^51486791 is an apocalyptic number.

51486791 is a deficient number, since it is larger than the sum of its proper divisors (1).

51486791 is an equidigital number, since it uses as much as digits as its factorization.

51486791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 41.

The square root of 51486791 is about 7175.4296735457. The cubic root of 51486791 is about 372.0191317674.

The spelling of 51486791 in words is "fifty-one million, four hundred eighty-six thousand, seven hundred ninety-one".