51191233 has 8 divisors (see below), whose sum is σ = 54348840. Its totient is φ = 48049920.

The previous prime is 51191221. The next prime is 51191243. The reversal of 51191233 is 33219115.

It can be written as a sum of positive squares in 4 ways, for example, as 2985984 + 48205249 = 1728^2 + 6943^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51191233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51191198 and 51191207.

It is not an unprimeable number, because it can be changed into a prime (51191243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2743 + ... + 10483.

It is an arithmetic number, because the mean of its divisors is an integer number (6793605).

Almost surely, 2^51191233 is an apocalyptic number.

It is an amenable number.

51191233 is a deficient number, since it is larger than the sum of its proper divisors (3157607).

51191233 is a wasteful number, since it uses less digits than its factorization.

51191233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8147.

The product of its digits is 810, while the sum is 25.

The square root of 51191233 is about 7154.8048890239. The cubic root of 51191233 is about 371.3059113077.

The spelling of 51191233 in words is "fifty-one million, one hundred ninety-one thousand, two hundred thirty-three".