51399167 has 4 divisors (see below), whose sum is σ = 51433536. Its totient is φ = 51364800.

The previous prime is 51399157. The next prime is 51399169. The reversal of 51399167 is 76199315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76199315 = 5 ⋅15239863.

It is a cyclic number.

It is not a de Polignac number, because 51399167 - 2²⁰ = 50350591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51399169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14834 + ... + 17967.

It is an arithmetic number, because the mean of its divisors is an integer number (12858384).

Almost surely, 2^51399167 is an apocalyptic number.

51399167 is a deficient number, since it is larger than the sum of its proper divisors (34369).

51399167 is a wasteful number, since it uses less digits than its factorization.

51399167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34368.

The product of its digits is 51030, while the sum is 41.

The square root of 51399167 is about 7169.3212370489. The cubic root of 51399167 is about 371.8079687764.

The spelling of 51399167 in words is "fifty-one million, three hundred ninety-nine thousand, one hundred sixty-seven".