991199010 has 64 divisors (see below), whose sum is σ = 2401331328. Its totient is φ = 261840384.

The previous prime is 991199003. The next prime is 991199023. The reversal of 991199010 is 10991199.

It is a self number, because there is not a number n which added to its sum of digits gives 991199010.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2657184 + ... + 2657556.

It is an arithmetic number, because the mean of its divisors is an integer number (37520802).

Almost surely, 2^991199010 is an apocalyptic number.

991199010 is an abundant number, since it is smaller than the sum of its proper divisors (1410132318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

991199010 is a wasteful number, since it uses less digits than its factorization.

991199010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979.

The product of its (nonzero) digits is 6561, while the sum is 39.

The square root of 991199010 is about 31483.3131992171. The cubic root of 991199010 is about 997.0576879572.

The spelling of 991199010 in words is "nine hundred ninety-one million, one hundred ninety-nine thousand, ten".