51081507489 has 4 divisors (see below), whose sum is σ = 68108676656. Its totient is φ = 34054338324.

The previous prime is 51081507473. The next prime is 51081507527. The reversal of 51081507489 is 98470518015.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 51081507489 - 2⁴ = 51081507473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51081507089) 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 3 ways as a sum of consecutive naturals, for example, 8513584579 + ... + 8513584584.

It is an arithmetic number, because the mean of its divisors is an integer number (17027169164).

Almost surely, 2^51081507489 is an apocalyptic number.

It is an amenable number.

51081507489 is a deficient number, since it is larger than the sum of its proper divisors (17027169167).

51081507489 is a wasteful number, since it uses less digits than its factorization.

51081507489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17027169166.

The product of its (nonzero) digits is 403200, while the sum is 48.

The spelling of 51081507489 in words is "fifty-one billion, eighty-one million, five hundred seven thousand, four hundred eighty-nine".