51240445 has 4 divisors (see below), whose sum is σ = 61488540. Its totient is φ = 40992352.

The previous prime is 51240439. The next prime is 51240451. The reversal of 51240445 is 54404215.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (51240439) and next prime (51240451).

It can be written as a sum of positive squares in 2 ways, for example, as 18852964 + 32387481 = 4342^2 + 5691^2 .

It is a cyclic number.

It is not a de Polignac number, because 51240445 - 2³ = 51240437 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5124040 + ... + 5124049.

It is an arithmetic number, because the mean of its divisors is an integer number (15372135).

Almost surely, 2^51240445 is an apocalyptic number.

It is an amenable number.

51240445 is a deficient number, since it is larger than the sum of its proper divisors (10248095).

51240445 is a wasteful number, since it uses less digits than its factorization.

51240445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10248094.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 51240445 is about 7158.2431503826. The cubic root of 51240445 is about 371.4248565069.

The spelling of 51240445 in words is "fifty-one million, two hundred forty thousand, four hundred forty-five".