51485893 has 2 divisors, whose sum is σ = 51485894. Its totient is φ = 51485892.

The previous prime is 51485887. The next prime is 51485897. The reversal of 51485893 is 39858415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49589764 + 1896129 = 7042^2 + 1377^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51485893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51485897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25742946 + 25742947.

It is an arithmetic number, because the mean of its divisors is an integer number (25742947).

Almost surely, 2^51485893 is an apocalyptic number.

It is an amenable number.

51485893 is a deficient number, since it is larger than the sum of its proper divisors (1).

51485893 is an equidigital number, since it uses as much as digits as its factorization.

51485893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172800, while the sum is 43.

The square root of 51485893 is about 7175.3670986229. The cubic root of 51485893 is about 372.0169689142.

The spelling of 51485893 in words is "fifty-one million, four hundred eighty-five thousand, eight hundred ninety-three".