51444454 has 4 divisors (see below), whose sum is σ = 77166684. Its totient is φ = 25722226.

The previous prime is 51444443. The next prime is 51444509. The reversal of 51444454 is 45444415.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45444415 = 5 ⋅9088883.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12861112 + ... + 12861115.

It is an arithmetic number, because the mean of its divisors is an integer number (19291671).

Almost surely, 2^51444454 is an apocalyptic number.

51444454 is a deficient number, since it is larger than the sum of its proper divisors (25722230).

51444454 is a wasteful number, since it uses less digits than its factorization.

51444454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25722229.

The product of its digits is 25600, while the sum is 31.

The square root of 51444454 is about 7172.4789299098. The cubic root of 51444454 is about 371.9171347781.

Adding to 51444454 its reverse (45444415), we get a palindrome (96888869).

The spelling of 51444454 in words is "fifty-one million, four hundred forty-four thousand, four hundred fifty-four".