991425212 has 24 divisors (see below), whose sum is σ = 1859365536. Its totient is φ = 461343168.

The previous prime is 991425209. The next prime is 991425221. The reversal of 991425212 is 212524199.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142223 + ... + 149030.

It is an arithmetic number, because the mean of its divisors is an integer number (77473564).

Almost surely, 2^991425212 is an apocalyptic number.

991425212 is a gapful number since it is divisible by the number (92) formed by its first and last digit.

It is an amenable number.

991425212 is a deficient number, since it is larger than the sum of its proper divisors (867940324).

991425212 is a wasteful number, since it uses less digits than its factorization.

991425212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291317 (or 291315 counting only the distinct ones).

The product of its digits is 12960, while the sum is 35.

The square root of 991425212 is about 31486.9054052633. The cubic root of 991425212 is about 997.1335285256.

The spelling of 991425212 in words is "nine hundred ninety-one million, four hundred twenty-five thousand, two hundred twelve".