51839491 has 4 divisors (see below), whose sum is σ = 56552184. Its totient is φ = 47126800.

The previous prime is 51839483. The next prime is 51839497. The reversal of 51839491 is 19493815.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51839491 - 2³ = 51839483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51839497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2356330 + ... + 2356351.

It is an arithmetic number, because the mean of its divisors is an integer number (14138046).

Almost surely, 2^51839491 is an apocalyptic number.

51839491 is a deficient number, since it is larger than the sum of its proper divisors (4712693).

51839491 is a wasteful number, since it uses less digits than its factorization.

51839491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4712692.

The product of its digits is 38880, while the sum is 40.

The square root of 51839491 is about 7199.9646526910. The cubic root of 51839491 is about 372.8666803545.

The spelling of 51839491 in words is "fifty-one million, eight hundred thirty-nine thousand, four hundred ninety-one".