51485591 has 4 divisors (see below), whose sum is σ = 51773400. Its totient is φ = 51197784.

The previous prime is 51485587. The next prime is 51485597. The reversal of 51485591 is 19558415.

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 51485591 - 2² = 51485587 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51485597) 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, 143636 + ... + 143993.

It is an arithmetic number, because the mean of its divisors is an integer number (12943350).

Almost surely, 2^51485591 is an apocalyptic number.

51485591 is a deficient number, since it is larger than the sum of its proper divisors (287809).

51485591 is a wasteful number, since it uses less digits than its factorization.

51485591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287808.

The product of its digits is 36000, while the sum is 38.

The square root of 51485591 is about 7175.3460543726. The cubic root of 51485591 is about 372.0162415347.

The spelling of 51485591 in words is "fifty-one million, four hundred eighty-five thousand, five hundred ninety-one".