51243955 has 12 divisors (see below), whose sum is σ = 71532720. Its totient is φ = 35138544.

The previous prime is 51243953. The next prime is 51243979. The reversal of 51243955 is 55934215.

It is not a de Polignac number, because 51243955 - 2¹ = 51243953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51243955.

It is not an unprimeable number, because it can be changed into a prime (51243953) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 104335 + ... + 104824.

It is an arithmetic number, because the mean of its divisors is an integer number (5961060).

Almost surely, 2^51243955 is an apocalyptic number.

51243955 is a deficient number, since it is larger than the sum of its proper divisors (20288765).

51243955 is a wasteful number, since it uses less digits than its factorization.

51243955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209178 (or 209171 counting only the distinct ones).

The product of its digits is 27000, while the sum is 34.

The square root of 51243955 is about 7158.4883180739. The cubic root of 51243955 is about 371.4333372522.

The spelling of 51243955 in words is "fifty-one million, two hundred forty-three thousand, nine hundred fifty-five".