991479 has 8 divisors (see below), whose sum is σ = 1330560. Its totient is φ = 656696.

The previous prime is 991453. The next prime is 991483. The reversal of 991479 is 974199.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 991479 - 2⁵ = 991447 is a prime.

991479 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991409) 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, 489 + ... + 1490.

It is an arithmetic number, because the mean of its divisors is an integer number (166320).

2⁹⁹¹⁴⁷⁹ is an apocalyptic number.

991479 is a deficient number, since it is larger than the sum of its proper divisors (339081).

991479 is a wasteful number, since it uses less digits than its factorization.

991479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2149.

The product of its digits is 20412, while the sum is 39.

The square root of 991479 is about 995.7303851947. The cubic root of 991479 is about 99.7151560764.

The spelling of 991479 in words is "nine hundred ninety-one thousand, four hundred seventy-nine".