991693498 has 4 divisors (see below), whose sum is σ = 1487540250. Its totient is φ = 495846748.

The previous prime is 991693457. The next prime is 991693501. The reversal of 991693498 is 894396199.

991693498 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 894396199 = 67 ⋅13349197.

It can be written as a sum of positive squares in only one way, i.e., 946977529 + 44715969 = 30773^2 + 6687^2 .

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247923373 + ... + 247923376.

Almost surely, 2^991693498 is an apocalyptic number.

991693498 is a deficient number, since it is larger than the sum of its proper divisors (495846752).

991693498 is a wasteful number, since it uses less digits than its factorization.

991693498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495846751.

The product of its digits is 3779136, while the sum is 58.

The square root of 991693498 is about 31491.1653960281. The cubic root of 991693498 is about 997.2234639827.

The spelling of 991693498 in words is "nine hundred ninety-one million, six hundred ninety-three thousand, four hundred ninety-eight".