991012010 has 16 divisors (see below), whose sum is σ = 1784180736. Its totient is φ = 396325008.

The previous prime is 991012007. The next prime is 991012027. The reversal of 991012010 is 10210199.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88127 + ... + 98733.

It is an arithmetic number, because the mean of its divisors is an integer number (111511296).

Almost surely, 2^991012010 is an apocalyptic number.

991012010 is a deficient number, since it is larger than the sum of its proper divisors (793168726).

991012010 is a wasteful number, since it uses less digits than its factorization.

991012010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19957.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 991012010 is about 31480.3432319281. The cubic root of 991012010 is about 996.9949822469.

The spelling of 991012010 in words is "nine hundred ninety-one million, twelve thousand, ten".