51869473 has 4 divisors (see below), whose sum is σ = 51978240. Its totient is φ = 51760708.

The previous prime is 51869443. The next prime is 51869491. The reversal of 51869473 is 37496815.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51869473 - 2⁹ = 51868961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51869423) 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, 53665 + ... + 54622.

It is an arithmetic number, because the mean of its divisors is an integer number (12994560).

Almost surely, 2^51869473 is an apocalyptic number.

It is an amenable number.

51869473 is a deficient number, since it is larger than the sum of its proper divisors (108767).

51869473 is a wasteful number, since it uses less digits than its factorization.

51869473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108766.

The product of its digits is 181440, while the sum is 43.

The square root of 51869473 is about 7202.0464452821. The cubic root of 51869473 is about 372.9385504935.

The spelling of 51869473 in words is "fifty-one million, eight hundred sixty-nine thousand, four hundred seventy-three".