51223689 has 12 divisors (see below), whose sum is σ = 80716272. Its totient is φ = 31044600.

The previous prime is 51223673. The next prime is 51223709. The reversal of 51223689 is 98632215.

It is not a de Polignac number, because 51223689 - 2⁴ = 51223673 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51223609) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 258607 + ... + 258804.

It is an arithmetic number, because the mean of its divisors is an integer number (6726356).

Almost surely, 2^51223689 is an apocalyptic number.

It is an amenable number.

51223689 is a deficient number, since it is larger than the sum of its proper divisors (29492583).

51223689 is a wasteful number, since it uses less digits than its factorization.

51223689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517428 (or 517425 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 51223689 is about 7157.0726557721. The cubic root of 51223689 is about 371.3843658788.

The spelling of 51223689 in words is "fifty-one million, two hundred twenty-three thousand, six hundred eighty-nine".