51543397 has 4 divisors (see below), whose sum is σ = 51884896. Its totient is φ = 51201900.

The previous prime is 51543379. The next prime is 51543413. The reversal of 51543397 is 79334515.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51543397 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 (51543307) 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, 170523 + ... + 170824.

It is an arithmetic number, because the mean of its divisors is an integer number (12971224).

Almost surely, 2^51543397 is an apocalyptic number.

It is an amenable number.

51543397 is a deficient number, since it is larger than the sum of its proper divisors (341499).

51543397 is a wasteful number, since it uses less digits than its factorization.

51543397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341498.

The product of its digits is 56700, while the sum is 37.

The square root of 51543397 is about 7179.3730227646. The cubic root of 51543397 is about 372.1554178700.

The spelling of 51543397 in words is "fifty-one million, five hundred forty-three thousand, three hundred ninety-seven".