51591911 has 8 divisors (see below), whose sum is σ = 59546784. Its totient is φ = 43783200.

The previous prime is 51591907. The next prime is 51591929. The reversal of 51591911 is 11919515.

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

It is a cyclic number.

It is not a de Polignac number, because 51591911 - 2² = 51591907 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 (51591941) 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, 35780 + ... + 37193.

It is an arithmetic number, because the mean of its divisors is an integer number (7443348).

Almost surely, 2^51591911 is an apocalyptic number.

51591911 is a deficient number, since it is larger than the sum of its proper divisors (7954873).

51591911 is a wasteful number, since it uses less digits than its factorization.

51591911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73081.

The product of its digits is 2025, while the sum is 32.

The square root of 51591911 is about 7182.7509354007. The cubic root of 51591911 is about 372.2721420767.

The spelling of 51591911 in words is "fifty-one million, five hundred ninety-one thousand, nine hundred eleven".