51861323 has 4 divisors (see below), whose sum is σ = 51940680. Its totient is φ = 51781968.

The previous prime is 51861319. The next prime is 51861331. The reversal of 51861323 is 32316815.

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 51861323 - 2² = 51861319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51161323) 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, 38690 + ... + 40007.

It is an arithmetic number, because the mean of its divisors is an integer number (12985170).

Almost surely, 2^51861323 is an apocalyptic number.

51861323 is a deficient number, since it is larger than the sum of its proper divisors (79357).

51861323 is an equidigital number, since it uses as much as digits as its factorization.

51861323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79356.

The product of its digits is 4320, while the sum is 29.

The square root of 51861323 is about 7201.4806116520. The cubic root of 51861323 is about 372.9190167921.

The spelling of 51861323 in words is "fifty-one million, eight hundred sixty-one thousand, three hundred twenty-three".