51547391 has 8 divisors (see below), whose sum is σ = 60165120. Its totient is φ = 43243128.

The previous prime is 51547369. The next prime is 51547459. The reversal of 51547391 is 19374515.

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 51547391 - 2¹⁰ = 51546367 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 (51547591) 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, 78011 + ... + 78668.

It is an arithmetic number, because the mean of its divisors is an integer number (7520640).

Almost surely, 2^51547391 is an apocalyptic number.

51547391 is a deficient number, since it is larger than the sum of its proper divisors (8617729).

51547391 is a wasteful number, since it uses less digits than its factorization.

51547391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156733.

The product of its digits is 18900, while the sum is 35.

The square root of 51547391 is about 7179.6511753706. The cubic root of 51547391 is about 372.1650301608.

The spelling of 51547391 in words is "fifty-one million, five hundred forty-seven thousand, three hundred ninety-one".