891129699 has 6 divisors (see below), whose sum is σ = 1287187356. Its totient is φ = 594086460.

The previous prime is 891129691. The next prime is 891129709. The reversal of 891129699 is 996921198.

It is not a de Polignac number, because 891129699 - 2³ = 891129691 is a prime.

It is a super-2 number, since 2×891129699² = 1588224280879661202, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (891129691) 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 5 ways as a sum of consecutive naturals, for example, 49507197 + ... + 49507214.

It is an arithmetic number, because the mean of its divisors is an integer number (214531226).

Almost surely, 2^891129699 is an apocalyptic number.

891129699 is a deficient number, since it is larger than the sum of its proper divisors (396057657).

891129699 is a wasteful number, since it uses less digits than its factorization.

891129699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99014417 (or 99014414 counting only the distinct ones).

The product of its digits is 629856, while the sum is 54.

The square root of 891129699 is about 29851.7955741359. The cubic root of 891129699 is about 962.3069874175.

The spelling of 891129699 in words is "eight hundred ninety-one million, one hundred twenty-nine thousand, six hundred ninety-nine".