991634 has 16 divisors (see below), whose sum is σ = 1713408. Its totient is φ = 421632.

The previous prime is 991633. The next prime is 991643. The reversal of 991634 is 436199.

It is a self number, because there is not a number n which added to its sum of digits gives 991634.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 991634.

It is not an unprimeable number, because it can be changed into a prime (991633) 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, 2519 + ... + 2885.

It is an arithmetic number, because the mean of its divisors is an integer number (107088).

2⁹⁹¹⁶³⁴ is an apocalyptic number.

991634 is a deficient number, since it is larger than the sum of its proper divisors (721774).

991634 is a wasteful number, since it uses less digits than its factorization.

991634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569.

The product of its digits is 5832, while the sum is 32.

The square root of 991634 is about 995.8082144670. The cubic root of 991634 is about 99.7203520325.

The spelling of 991634 in words is "nine hundred ninety-one thousand, six hundred thirty-four".