51842397 has 4 divisors (see below), whose sum is σ = 69123200. Its totient is φ = 34561596.

The previous prime is 51842359. The next prime is 51842429. The reversal of 51842397 is 79324815.

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 51842397 - 2¹⁰ = 51841373 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 (51842347) 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, 8640397 + ... + 8640402.

It is an arithmetic number, because the mean of its divisors is an integer number (17280800).

Almost surely, 2^51842397 is an apocalyptic number.

It is an amenable number.

51842397 is a deficient number, since it is larger than the sum of its proper divisors (17280803).

51842397 is a wasteful number, since it uses less digits than its factorization.

51842397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17280802.

The product of its digits is 60480, while the sum is 39.

The square root of 51842397 is about 7200.1664564092. The cubic root of 51842397 is about 372.8736475675.

The spelling of 51842397 in words is "fifty-one million, eight hundred forty-two thousand, three hundred ninety-seven".