991534 has 16 divisors (see below), whose sum is σ = 1587600. Its totient is φ = 463104.

The previous prime is 991531. The next prime is 991541. The reversal of 991534 is 435199.

991534 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 991496 and 991505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991531) 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, 3552 + ... + 3820.

It is an arithmetic number, because the mean of its divisors is an integer number (99225).

2⁹⁹¹⁵³⁴ is an apocalyptic number.

991534 is a deficient number, since it is larger than the sum of its proper divisors (596066).

991534 is a wasteful number, since it uses less digits than its factorization.

991534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387.

The product of its digits is 4860, while the sum is 31.

The square root of 991534 is about 995.7580027296. The cubic root of 991534 is about 99.7169998647.

The spelling of 991534 in words is "nine hundred ninety-one thousand, five hundred thirty-four".