51881273 has 4 divisors (see below), whose sum is σ = 51895680. Its totient is φ = 51866868.

The previous prime is 51881251. The next prime is 51881287. The reversal of 51881273 is 37218815.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 51881273 - 2¹⁸ = 51619129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51881213) 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, 3536 + ... + 10782.

It is an arithmetic number, because the mean of its divisors is an integer number (12973920).

Almost surely, 2^51881273 is an apocalyptic number.

It is an amenable number.

51881273 is a deficient number, since it is larger than the sum of its proper divisors (14407).

51881273 is an equidigital number, since it uses as much as digits as its factorization.

51881273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14406.

The product of its digits is 13440, while the sum is 35.

The square root of 51881273 is about 7202.8656102971. The cubic root of 51881273 is about 372.9668287914.

The spelling of 51881273 in words is "fifty-one million, eight hundred eighty-one thousand, two hundred seventy-three".