51442197 has 4 divisors (see below), whose sum is σ = 68589600. Its totient is φ = 34294796.

The previous prime is 51442169. The next prime is 51442207. The reversal of 51442197 is 79124415.

It is a happy number.

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 not a de Polignac number, because 51442197 - 2⁶ = 51442133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51442597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8573697 + ... + 8573702.

It is an arithmetic number, because the mean of its divisors is an integer number (17147400).

Almost surely, 2^51442197 is an apocalyptic number.

It is an amenable number.

51442197 is a deficient number, since it is larger than the sum of its proper divisors (17147403).

51442197 is a wasteful number, since it uses less digits than its factorization.

51442197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17147402.

The product of its digits is 10080, while the sum is 33.

The square root of 51442197 is about 7172.3215906706. The cubic root of 51442197 is about 371.9116957127.

The spelling of 51442197 in words is "fifty-one million, four hundred forty-two thousand, one hundred ninety-seven".