51551191 has 16 divisors (see below), whose sum is σ = 56160000. Its totient is φ = 47138688.

The previous prime is 51551179. The next prime is 51551221. The reversal of 51551191 is 19115515.

It is not a de Polignac number, because 51551191 - 2¹³ = 51542999 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 (51551111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103060 + ... + 103558.

It is an arithmetic number, because the mean of its divisors is an integer number (3510000).

Almost surely, 2^51551191 is an apocalyptic number.

51551191 is a deficient number, since it is larger than the sum of its proper divisors (4608809).

51551191 is a wasteful number, since it uses less digits than its factorization.

51551191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678.

The product of its digits is 1125, while the sum is 28.

The square root of 51551191 is about 7179.9158073058. The cubic root of 51551191 is about 372.1741750941.

The spelling of 51551191 in words is "fifty-one million, five hundred fifty-one thousand, one hundred ninety-one".