51243075 has 36 divisors (see below), whose sum is σ = 98847840. Its totient is φ = 25225920.

The previous prime is 51243053. The next prime is 51243079. The reversal of 51243075 is 57034215.

It is a happy number.

It is not a de Polignac number, because 51243075 - 2⁸ = 51242819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51243079) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5835 + ... + 11684.

Almost surely, 2^51243075 is an apocalyptic number.

51243075 is a deficient number, since it is larger than the sum of its proper divisors (47604765).

51243075 is a wasteful number, since it uses less digits than its factorization.

51243075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17548 (or 17540 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 51243075 is about 7158.4268523189. The cubic root of 51243075 is about 371.4312110618.

The spelling of 51243075 in words is "fifty-one million, two hundred forty-three thousand, seventy-five".