51442151 has 4 divisors (see below), whose sum is σ = 52146912. Its totient is φ = 50737392.

The previous prime is 51442133. The next prime is 51442163. The reversal of 51442151 is 15124415.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51442151 - 2⁶ = 51442087 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 (51442451) 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, 352271 + ... + 352416.

It is an arithmetic number, because the mean of its divisors is an integer number (13036728).

Almost surely, 2^51442151 is an apocalyptic number.

51442151 is a deficient number, since it is larger than the sum of its proper divisors (704761).

51442151 is an equidigital number, since it uses as much as digits as its factorization.

51442151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704760.

The product of its digits is 800, while the sum is 23.

The square root of 51442151 is about 7172.3183838979. The cubic root of 51442151 is about 371.9115848572.

Adding to 51442151 its reverse (15124415), we get a palindrome (66566566).

The spelling of 51442151 in words is "fifty-one million, four hundred forty-two thousand, one hundred fifty-one".