51997541 has 2 divisors, whose sum is σ = 51997542. Its totient is φ = 51997540.

The previous prime is 51997523. The next prime is 51997597. The reversal of 51997541 is 14579915.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33756100 + 18241441 = 5810^2 + 4271^2 .

It is a cyclic number.

It is not a de Polignac number, because 51997541 - 2²² = 47803237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51994541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25998770 + 25998771.

It is an arithmetic number, because the mean of its divisors is an integer number (25998771).

Almost surely, 2^51997541 is an apocalyptic number.

It is an amenable number.

51997541 is a deficient number, since it is larger than the sum of its proper divisors (1).

51997541 is an equidigital number, since it uses as much as digits as its factorization.

51997541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56700, while the sum is 41.

The square root of 51997541 is about 7210.9320479394. The cubic root of 51997541 is about 373.2452320986.

The spelling of 51997541 in words is "fifty-one million, nine hundred ninety-seven thousand, five hundred forty-one".