51912991 has 8 divisors (see below), whose sum is σ = 56402640. Its totient is φ = 47494272.

The previous prime is 51912989. The next prime is 51913009. The reversal of 51912991 is 19921915.

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 51912991 - 2¹ = 51912989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51912991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51912391) 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 7 ways as a sum of consecutive naturals, for example, 16201 + ... + 19138.

It is an arithmetic number, because the mean of its divisors is an integer number (7050330).

Almost surely, 2^51912991 is an apocalyptic number.

51912991 is a deficient number, since it is larger than the sum of its proper divisors (4489649).

51912991 is a wasteful number, since it uses less digits than its factorization.

51912991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35465.

The product of its digits is 7290, while the sum is 37.

The square root of 51912991 is about 7205.0670364682. The cubic root of 51912991 is about 373.0428186510.

The spelling of 51912991 in words is "fifty-one million, nine hundred twelve thousand, nine hundred ninety-one".