51997542 has 16 divisors (see below), whose sum is σ = 104095152. Its totient is φ = 17315840.

The previous prime is 51997541. The next prime is 51997597. The reversal of 51997542 is 24579915.

It is a junction number, because it is equal to n+sod(n) for n = 51997494 and 51997503.

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 7 ways as a sum of consecutive naturals, for example, 3742 + ... + 10862.

It is an arithmetic number, because the mean of its divisors is an integer number (6505947).

Almost surely, 2^51997542 is an apocalyptic number.

51997542 is an abundant number, since it is smaller than the sum of its proper divisors (52097610).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51997542 is a wasteful number, since it uses less digits than its factorization.

51997542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8343.

The product of its digits is 113400, while the sum is 42.

The square root of 51997542 is about 7210.9321172786. The cubic root of 51997542 is about 373.2452344914.

The spelling of 51997542 in words is "fifty-one million, nine hundred ninety-seven thousand, five hundred forty-two".