991866029 has 16 divisors (see below), whose sum is σ = 1243537920. Its totient is φ = 768554160.

The previous prime is 991866017. The next prime is 991866047. The reversal of 991866029 is 920668199.

It is a de Polignac number, because none of the positive numbers 2^k-991866029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991866089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22199 + ... + 49764.

It is an arithmetic number, because the mean of its divisors is an integer number (77721120).

Almost surely, 2^991866029 is an apocalyptic number.

It is an amenable number.

991866029 is a deficient number, since it is larger than the sum of its proper divisors (251671891).

991866029 is a wasteful number, since it uses less digits than its factorization.

991866029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72160.

The product of its (nonzero) digits is 419904, while the sum is 50.

The square root of 991866029 is about 31493.9046324840. The cubic root of 991866029 is about 997.2812916566.

The spelling of 991866029 in words is "nine hundred ninety-one million, eight hundred sixty-six thousand, twenty-nine".