991529279 has 8 divisors (see below), whose sum is σ = 1085899920. Its totient is φ = 899744256.

The previous prime is 991529243. The next prime is 991529299. The reversal of 991529279 is 972925199.

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 991529279 - 2¹⁶ = 991463743 is a prime.

It is a super-2 number, since 2×991529279² = 1966260622228519682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 991529279.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991529299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 645602 + ... + 647135.

It is an arithmetic number, because the mean of its divisors is an integer number (135737490).

Almost surely, 2^991529279 is an apocalyptic number.

991529279 is a deficient number, since it is larger than the sum of its proper divisors (94370641).

991529279 is a wasteful number, since it uses less digits than its factorization.

991529279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1292809.

The product of its digits is 918540, while the sum is 53.

The square root of 991529279 is about 31488.5579060077. The cubic root of 991529279 is about 997.1684160333.

The spelling of 991529279 in words is "nine hundred ninety-one million, five hundred twenty-nine thousand, two hundred seventy-nine".