51591161 has 8 divisors (see below), whose sum is σ = 54555648. Its totient is φ = 48708000.

The previous prime is 51591151. The next prime is 51591173. The reversal of 51591161 is 16119515.

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

It is not a de Polignac number, because 51591161 - 2¹⁰ = 51590137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51591121) 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, 19025 + ... + 21566.

It is an arithmetic number, because the mean of its divisors is an integer number (6819456).

Almost surely, 2^51591161 is an apocalyptic number.

It is an amenable number.

51591161 is a deficient number, since it is larger than the sum of its proper divisors (2964487).

51591161 is a wasteful number, since it uses less digits than its factorization.

51591161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40663.

The product of its digits is 1350, while the sum is 29.

The square root of 51591161 is about 7182.6987268018. The cubic root of 51591161 is about 372.2703381411.

The spelling of 51591161 in words is "fifty-one million, five hundred ninety-one thousand, one hundred sixty-one".