51997533 has 8 divisors (see below), whose sum is σ = 79234368. Its totient is φ = 29712864.

The previous prime is 51997523. The next prime is 51997541. The reversal of 51997533 is 33579915.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51997533 - 2¹⁰ = 51996509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51997513) 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, 1238016 + ... + 1238057.

It is an arithmetic number, because the mean of its divisors is an integer number (9904296).

Almost surely, 2^51997533 is an apocalyptic number.

It is an amenable number.

51997533 is a deficient number, since it is larger than the sum of its proper divisors (27236835).

51997533 is a wasteful number, since it uses less digits than its factorization.

51997533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2476083.

The product of its digits is 127575, while the sum is 42.

The square root of 51997533 is about 7210.9314932261. The cubic root of 51997533 is about 373.2452129570.

The spelling of 51997533 in words is "fifty-one million, nine hundred ninety-seven thousand, five hundred thirty-three".