51478191 has 12 divisors (see below), whose sum is σ = 75125232. Its totient is φ = 33964416.

The previous prime is 51478169. The next prime is 51478199. The reversal of 51478191 is 19187415.

It is not a de Polignac number, because 51478191 - 2⁶ = 51478127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51478199) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28611 + ... + 30356.

It is an arithmetic number, because the mean of its divisors is an integer number (6260436).

Almost surely, 2^51478191 is an apocalyptic number.

51478191 is a deficient number, since it is larger than the sum of its proper divisors (23647041).

51478191 is a wasteful number, since it uses less digits than its factorization.

51478191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59070 (or 59067 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 51478191 is about 7174.8303812703. The cubic root of 51478191 is about 371.9984174404.

The spelling of 51478191 in words is "fifty-one million, four hundred seventy-eight thousand, one hundred ninety-one".