51891167 has 2 divisors, whose sum is σ = 51891168. Its totient is φ = 51891166.

The previous prime is 51891139. The next prime is 51891173. The reversal of 51891167 is 76119815.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51891167 - 2⁸ = 51890911 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51891167.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51891137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25945583 + 25945584.

It is an arithmetic number, because the mean of its divisors is an integer number (25945584).

Almost surely, 2^51891167 is an apocalyptic number.

51891167 is a deficient number, since it is larger than the sum of its proper divisors (1).

51891167 is an equidigital number, since it uses as much as digits as its factorization.

51891167 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 38.

The square root of 51891167 is about 7203.5523875377. The cubic root of 51891167 is about 372.9905361206.

The spelling of 51891167 in words is "fifty-one million, eight hundred ninety-one thousand, one hundred sixty-seven".