991498 has 4 divisors (see below), whose sum is σ = 1487250. Its totient is φ = 495748.

The previous prime is 991493. The next prime is 991499. The reversal of 991498 is 894199.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 734449 + 257049 = 857^2 + 507^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 991498.

It is not an unprimeable number, because it can be changed into a prime (991493) by changing a digit.

991498 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 as a sum of consecutive naturals, namely, 247873 + ... + 247876.

2⁹⁹¹⁴⁹⁸ is an apocalyptic number.

991498 is a deficient number, since it is larger than the sum of its proper divisors (495752).

991498 is a wasteful number, since it uses less digits than its factorization.

991498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495751.

The product of its digits is 23328, while the sum is 40.

The square root of 991498 is about 995.7399258843. The cubic root of 991498 is about 99.7157930292.

The spelling of 991498 in words is "nine hundred ninety-one thousand, four hundred ninety-eight".