51489223723 has 32 divisors (see below), whose sum is σ = 61913834496. Its totient is φ = 41864853888.

The previous prime is 51489223697. The next prime is 51489223729. The reversal of 51489223723 is 32732298415.

It is a cyclic number.

It is not a de Polignac number, because 51489223723 - 2³³ = 42899289131 is a prime.

It is a super-2 number, since 2×51489223723² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51489223729) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15493140 + ... + 15496462.

It is an arithmetic number, because the mean of its divisors is an integer number (1934807328).

Almost surely, 2^51489223723 is an apocalyptic number.

51489223723 is a deficient number, since it is larger than the sum of its proper divisors (10424610773).

51489223723 is a wasteful number, since it uses less digits than its factorization.

51489223723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4123.

The product of its digits is 725760, while the sum is 46.

The spelling of 51489223723 in words is "fifty-one billion, four hundred eighty-nine million, two hundred twenty-three thousand, seven hundred twenty-three".