51445349 has 4 divisors (see below), whose sum is σ = 54471564. Its totient is φ = 48419136.

The previous prime is 51445343. The next prime is 51445357. The reversal of 51445349 is 94354415.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94354415 = 5 ⋅18870883.

It can be written as a sum of positive squares in 2 ways, for example, as 33721249 + 17724100 = 5807^2 + 4210^2 .

It is a cyclic number.

It is not a de Polignac number, because 51445349 - 2¹² = 51441253 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 (51445343) 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, 1513082 + ... + 1513115.

It is an arithmetic number, because the mean of its divisors is an integer number (13617891).

Almost surely, 2^51445349 is an apocalyptic number.

It is an amenable number.

51445349 is a deficient number, since it is larger than the sum of its proper divisors (3026215).

51445349 is a wasteful number, since it uses less digits than its factorization.

51445349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3026214.

The product of its digits is 43200, while the sum is 35.

The square root of 51445349 is about 7172.5413208988. The cubic root of 51445349 is about 371.9192915633.

The spelling of 51445349 in words is "fifty-one million, four hundred forty-five thousand, three hundred forty-nine".