51987423 has 4 divisors (see below), whose sum is σ = 69316568. Its totient is φ = 34658280.

The previous prime is 51987409. The next prime is 51987443. The reversal of 51987423 is 32478915.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 51987423 - 2⁶ = 51987359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51987443) 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, 8664568 + ... + 8664573.

It is an arithmetic number, because the mean of its divisors is an integer number (17329142).

Almost surely, 2^51987423 is an apocalyptic number.

51987423 is a deficient number, since it is larger than the sum of its proper divisors (17329145).

51987423 is a wasteful number, since it uses less digits than its factorization.

51987423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17329144.

The product of its digits is 60480, while the sum is 39.

The square root of 51987423 is about 7210.2304401454. The cubic root of 51987423 is about 373.2210210804.

It can be divided in two parts, 5198 and 7423, that added together give a palindrome (12621).

The spelling of 51987423 in words is "fifty-one million, nine hundred eighty-seven thousand, four hundred twenty-three".