51444551 has 4 divisors (see below), whose sum is σ = 51498504. Its totient is φ = 51390600.

The previous prime is 51444527. The next prime is 51444559. The reversal of 51444551 is 15544415.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51444551 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 (51444559) 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, 25520 + ... + 27461.

It is an arithmetic number, because the mean of its divisors is an integer number (12874626).

Almost surely, 2^51444551 is an apocalyptic number.

51444551 is a deficient number, since it is larger than the sum of its proper divisors (53953).

51444551 is an equidigital number, since it uses as much as digits as its factorization.

51444551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53952.

The product of its digits is 8000, while the sum is 29.

The square root of 51444551 is about 7172.4856918644. The cubic root of 51444551 is about 371.9173685314.

Adding to 51444551 its reverse (15544415), we get a palindrome (66988966).

The spelling of 51444551 in words is "fifty-one million, four hundred forty-four thousand, five hundred fifty-one".