991026969 has 8 divisors (see below), whose sum is σ = 1323081792. Its totient is φ = 659828400.

The previous prime is 991026899. The next prime is 991026979. The reversal of 991026969 is 969620199.

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

It is not a de Polignac number, because 991026969 - 2¹¹ = 991024921 is a prime.

It is a super-2 number, since 2×991026969² = 1964268906570653922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (991026979) 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, 211357 + ... + 215994.

It is an arithmetic number, because the mean of its divisors is an integer number (165385224).

Almost surely, 2^991026969 is an apocalyptic number.

It is an amenable number.

991026969 is a deficient number, since it is larger than the sum of its proper divisors (332054823).

991026969 is a wasteful number, since it uses less digits than its factorization.

991026969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428127.

The product of its (nonzero) digits is 472392, while the sum is 51.

The square root of 991026969 is about 31480.5808237396. The cubic root of 991026969 is about 996.9999986586. Note that the first 5 decimals are identical.

The spelling of 991026969 in words is "nine hundred ninety-one million, twenty-six thousand, nine hundred sixty-nine".