51443125 has 20 divisors (see below), whose sum is σ = 65538396. Its totient is φ = 40352000.

The previous prime is 51443123. The next prime is 51443143. The reversal of 51443125 is 52134415.

It is a happy number.

It can be written as a sum of positive squares in 10 ways, for example, as 44169316 + 7273809 = 6646^2 + 2697^2 .

It is not a de Polignac number, because 51443125 - 2¹ = 51443123 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51443125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51443123) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 32349 + ... + 33901.

Almost surely, 2^51443125 is an apocalyptic number.

It is an amenable number.

51443125 is a deficient number, since it is larger than the sum of its proper divisors (14095271).

51443125 is an equidigital number, since it uses as much as digits as its factorization.

51443125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1626 (or 1611 counting only the distinct ones).

The product of its digits is 2400, while the sum is 25.

The square root of 51443125 is about 7172.3862835182. The cubic root of 51443125 is about 371.9139320867.

The spelling of 51443125 in words is "fifty-one million, four hundred forty-three thousand, one hundred twenty-five".