51873181 has 4 divisors (see below), whose sum is σ = 52216864. Its totient is φ = 51529500.

The previous prime is 51873163. The next prime is 51873187. The reversal of 51873181 is 18137815.

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 51873181 - 2⁷ = 51873053 is a prime.

It is a super-2 number, since 2×51873181² = 5381653814117522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51873187) 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, 171615 + ... + 171916.

It is an arithmetic number, because the mean of its divisors is an integer number (13054216).

Almost surely, 2^51873181 is an apocalyptic number.

It is an amenable number.

51873181 is a deficient number, since it is larger than the sum of its proper divisors (343683).

51873181 is a wasteful number, since it uses less digits than its factorization.

51873181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343682.

The product of its digits is 6720, while the sum is 34.

The square root of 51873181 is about 7202.3038675135. The cubic root of 51873181 is about 372.9474370512.

The spelling of 51873181 in words is "fifty-one million, eight hundred seventy-three thousand, one hundred eighty-one".