51985567 has 2 divisors, whose sum is σ = 51985568. Its totient is φ = 51985566.

The previous prime is 51985529. The next prime is 51985573. The reversal of 51985567 is 76558915.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51985567 is a prime.

It is a super-2 number, since 2×51985567² = 5404998352622978, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51985517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25992783 + 25992784.

It is an arithmetic number, because the mean of its divisors is an integer number (25992784).

Almost surely, 2^51985567 is an apocalyptic number.

51985567 is a deficient number, since it is larger than the sum of its proper divisors (1).

51985567 is an equidigital number, since it uses as much as digits as its factorization.

51985567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 378000, while the sum is 46.

The square root of 51985567 is about 7210.1017329855. The cubic root of 51985567 is about 373.2165795802.

The spelling of 51985567 in words is "fifty-one million, nine hundred eighty-five thousand, five hundred sixty-seven".