991274501723 has 8 divisors (see below), whose sum is σ = 1083958993776. Its totient is φ = 899018114400.

The previous prime is 991274501681. The next prime is 991274501741. The reversal of 991274501723 is 327105472199.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 991274501723 - 2³⁸ = 716396594779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991274501773) 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 7 ways as a sum of consecutive naturals, for example, 107021336 + ... + 107030597.

It is an arithmetic number, because the mean of its divisors is an integer number (135494874222).

Almost surely, 2^991274501723 is an apocalyptic number.

991274501723 is a deficient number, since it is larger than the sum of its proper divisors (92684492053).

991274501723 is a wasteful number, since it uses less digits than its factorization.

991274501723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214052365.

The product of its (nonzero) digits is 952560, while the sum is 50.

The spelling of 991274501723 in words is "nine hundred ninety-one billion, two hundred seventy-four million, five hundred one thousand, seven hundred twenty-three".