51997549 has 4 divisors (see below), whose sum is σ = 54258336. Its totient is φ = 49736764.

The previous prime is 51997541. The next prime is 51997597. The reversal of 51997549 is 94579915.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 51997549 - 2³ = 51997541 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 (51997541) 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, 1130359 + ... + 1130404.

It is an arithmetic number, because the mean of its divisors is an integer number (13564584).

Almost surely, 2^51997549 is an apocalyptic number.

It is an amenable number.

51997549 is a deficient number, since it is larger than the sum of its proper divisors (2260787).

51997549 is a wasteful number, since it uses less digits than its factorization.

51997549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2260786.

The product of its digits is 510300, while the sum is 49.

The square root of 51997549 is about 7210.9326026527. The cubic root of 51997549 is about 373.2452512403.

The spelling of 51997549 in words is "fifty-one million, nine hundred ninety-seven thousand, five hundred forty-nine".