51276191 has 4 divisors (see below), whose sum is σ = 52662072. Its totient is φ = 49890312.

The previous prime is 51276187. The next prime is 51276209. The reversal of 51276191 is 19167215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19167215 = 5 ⋅3833443.

It is a cyclic number.

It is not a de Polignac number, because 51276191 - 2² = 51276187 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 (51276091) 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, 692885 + ... + 692958.

It is an arithmetic number, because the mean of its divisors is an integer number (13165518).

Almost surely, 2^51276191 is an apocalyptic number.

51276191 is a deficient number, since it is larger than the sum of its proper divisors (1385881).

51276191 is a wasteful number, since it uses less digits than its factorization.

51276191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1385880.

The product of its digits is 3780, while the sum is 32.

The square root of 51276191 is about 7160.7395567776. The cubic root of 51276191 is about 371.5112066985.

The spelling of 51276191 in words is "fifty-one million, two hundred seventy-six thousand, one hundred ninety-one".