991602 has 20 divisors (see below), whose sum is σ = 2222286. Its totient is φ = 330480.

The previous prime is 991579. The next prime is 991603. The reversal of 991602 is 206199.

It is a happy number.

991602 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 962361 + 29241 = 981^2 + 171^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 991602.

It is not an unprimeable number, because it can be changed into a prime (991603) by changing a digit.

991602 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2899 + ... + 3222.

2⁹⁹¹⁶⁰² is an apocalyptic number.

991602 is an abundant number, since it is smaller than the sum of its proper divisors (1230684).

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

991602 is a wasteful number, since it uses less digits than its factorization.

991602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6135 (or 6126 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 991602 is about 995.7921469865. The cubic root of 991602 is about 99.7192793633.

The spelling of 991602 in words is "nine hundred ninety-one thousand, six hundred two".