51159591 has 12 divisors (see below), whose sum is σ = 84454032. Its totient is φ = 29234016.

The previous prime is 51159557. The next prime is 51159601. The reversal of 51159591 is 19595115.

51159591 is a `hidden beast` number, since 5 + 11 + 59 + 591 = 666.

It is not a de Polignac number, because 51159591 - 2⁹ = 51159079 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51159491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 405966 + ... + 406091.

It is an arithmetic number, because the mean of its divisors is an integer number (7037836).

Almost surely, 2^51159591 is an apocalyptic number.

51159591 is a deficient number, since it is larger than the sum of its proper divisors (33294441).

51159591 is a wasteful number, since it uses less digits than its factorization.

51159591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812070 (or 812067 counting only the distinct ones).

The product of its digits is 10125, while the sum is 36.

The square root of 51159591 is about 7152.5933059276. The cubic root of 51159591 is about 371.2293924554.

It can be divided in two parts, 5115 and 9591, that added together give a triangular number (14706 = T₁₇₁).

The spelling of 51159591 in words is "fifty-one million, one hundred fifty-nine thousand, five hundred ninety-one".