991327434 has 16 divisors (see below), whose sum is σ = 1986221088. Its totient is φ = 329848112.

The previous prime is 991327433. The next prime is 991327453. The reversal of 991327434 is 434723199.

It is not an unprimeable number, because it can be changed into a prime (991327433) 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, 144972 + ... + 151655.

It is an arithmetic number, because the mean of its divisors is an integer number (124138818).

Almost surely, 2^991327434 is an apocalyptic number.

991327434 is an abundant number, since it is smaller than the sum of its proper divisors (994893654).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

991327434 is a wasteful number, since it uses less digits than its factorization.

991327434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297189.

The product of its digits is 163296, while the sum is 42.

The square root of 991327434 is about 31485.3526897826. The cubic root of 991327434 is about 997.1007471228.

The spelling of 991327434 in words is "nine hundred ninety-one million, three hundred twenty-seven thousand, four hundred thirty-four".