51654139 has 4 divisors (see below), whose sum is σ = 51750160. Its totient is φ = 51558120.

The previous prime is 51654121. The next prime is 51654151. The reversal of 51654139 is 93145615.

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 51654139 - 2⁵ = 51654107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51654839) 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, 47199 + ... + 48280.

It is an arithmetic number, because the mean of its divisors is an integer number (12937540).

Almost surely, 2^51654139 is an apocalyptic number.

51654139 is a deficient number, since it is larger than the sum of its proper divisors (96021).

51654139 is an equidigital number, since it uses as much as digits as its factorization.

51654139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96020.

The product of its digits is 16200, while the sum is 34.

The square root of 51654139 is about 7187.0813965058. The cubic root of 51654139 is about 372.4217549572.

The spelling of 51654139 in words is "fifty-one million, six hundred fifty-four thousand, one hundred thirty-nine".