51491534973 has 8 divisors (see below), whose sum is σ = 68698056000. Its totient is φ = 34306351968.

The previous prime is 51491534971. The next prime is 51491534981. The reversal of 51491534973 is 37943519415.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51491534973 - 2¹ = 51491534971 is a prime.

It is a super-2 number, since 2×51491534973² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51491534971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5328873 + ... + 5338526.

It is an arithmetic number, because the mean of its divisors is an integer number (8587257000).

Almost surely, 2^51491534973 is an apocalyptic number.

It is an amenable number.

51491534973 is a deficient number, since it is larger than the sum of its proper divisors (17206521027).

51491534973 is a wasteful number, since it uses less digits than its factorization.

51491534973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10669011.

The product of its digits is 2041200, while the sum is 51.

The spelling of 51491534973 in words is "fifty-one billion, four hundred ninety-one million, five hundred thirty-four thousand, nine hundred seventy-three".