51994488529 has 3 divisors (see below), whose sum is σ = 51994716553. Its totient is φ = 51994260506.

The previous prime is 51994488509. The next prime is 51994488541. The reversal of 51994488529 is 92588449915.

The square root of 51994488529 is 228023.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 51994488529 - 2⁷ = 51994488401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51994488509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 114012 + ... + 342034.

Almost surely, 2^51994488529 is an apocalyptic number.

51994488529 is the 228023-rd square number.

51994488529 is the 114012-nd centered octagonal number.

It is an amenable number.

51994488529 is a deficient number, since it is larger than the sum of its proper divisors (228024).

51994488529 is an frugal number, since it uses more digits than its factorization.

51994488529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456046 (or 228023 counting only the distinct ones).

The product of its digits is 37324800, while the sum is 64.

Multiplying 51994488529 by its sum of digits (64), we get a square (3327647265856 = 1824184²).

The spelling of 51994488529 in words is "fifty-one billion, nine hundred ninety-four million, four hundred eighty-eight thousand, five hundred twenty-nine".