991927274473 has 4 divisors (see below), whose sum is σ = 992203350228. Its totient is φ = 991651198720.

The previous prime is 991927274447. The next prime is 991927274489. The reversal of 991927274473 is 374472729199.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 504706522329 + 487220752144 = 710427^2 + 698012^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-991927274473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991927274573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138032488 + ... + 138039673.

It is an arithmetic number, because the mean of its divisors is an integer number (248050837557).

Almost surely, 2^991927274473 is an apocalyptic number.

It is an amenable number.

991927274473 is a deficient number, since it is larger than the sum of its proper divisors (276075755).

991927274473 is a wasteful number, since it uses less digits than its factorization.

991927274473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276075754.

The product of its digits is 48009024, while the sum is 64.

The spelling of 991927274473 in words is "nine hundred ninety-one billion, nine hundred twenty-seven million, two hundred seventy-four thousand, four hundred seventy-three".