980899991 has 6 divisors (see below), whose sum is σ = 999759600. Its totient is φ = 962389688.

The previous prime is 980899963. The next prime is 980900027. The reversal of 980899991 is 199998089.

It is not a de Polignac number, because 980899991 - 2¹⁰ = 980898967 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 (980899901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 171791 + ... + 177408.

It is an arithmetic number, because the mean of its divisors is an integer number (166626600).

Almost surely, 2^980899991 is an apocalyptic number.

980899991 is a deficient number, since it is larger than the sum of its proper divisors (18859609).

980899991 is an equidigital number, since it uses as much as digits as its factorization.

980899991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349305 (or 349252 counting only the distinct ones).

The product of its (nonzero) digits is 3779136, while the sum is 62.

The square root of 980899991 is about 31319.3229652239. The cubic root of 980899991 is about 993.5923601799.

The spelling of 980899991 in words is "nine hundred eighty million, eight hundred ninety-nine thousand, nine hundred ninety-one".