51242923 has 4 divisors (see below), whose sum is σ = 51269760. Its totient is φ = 51216088.

The previous prime is 51242921. The next prime is 51242927. The reversal of 51242923 is 32924215.

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

It is a cyclic number.

It is not a de Polignac number, because 51242923 - 2¹ = 51242921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51242891 and 51242900.

It is not an unprimeable number, because it can be changed into a prime (51242921) 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, 10315 + ... + 14452.

It is an arithmetic number, because the mean of its divisors is an integer number (12817440).

Almost surely, 2^51242923 is an apocalyptic number.

51242923 is a deficient number, since it is larger than the sum of its proper divisors (26837).

51242923 is a wasteful number, since it uses less digits than its factorization.

51242923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26836.

The product of its digits is 4320, while the sum is 28.

The square root of 51242923 is about 7158.4162354532. The cubic root of 51242923 is about 371.4308438083.

The spelling of 51242923 in words is "fifty-one million, two hundred forty-two thousand, nine hundred twenty-three".