991982973074 has 8 divisors (see below), whose sum is σ = 1488226804668. Its totient is φ = 495907371520.

The previous prime is 991982973073. The next prime is 991982973077. The reversal of 991982973074 is 470379289199.

It can be written as a sum of positive squares in 2 ways, for example, as 985224982225 + 6757990849 = 992585^2 + 82207^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 991982972995 and 991982973013.

It is not an unprimeable number, because it can be changed into a prime (991982973073) 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, 42042767 + ... + 42066354.

Almost surely, 2^991982973074 is an apocalyptic number.

991982973074 is a deficient number, since it is larger than the sum of its proper divisors (496243831594).

991982973074 is a wasteful number, since it uses less digits than its factorization.

991982973074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84115020.

The product of its (nonzero) digits is 61725888, while the sum is 68.

The spelling of 991982973074 in words is "nine hundred ninety-one billion, nine hundred eighty-two million, nine hundred seventy-three thousand, seventy-four".