991054020 has 48 divisors (see below), whose sum is σ = 3027221568. Its totient is φ = 240255360.

The previous prime is 991054019. The next prime is 991054037. The reversal of 991054020 is 20450199.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 750139 + ... + 751458.

It is an arithmetic number, because the mean of its divisors is an integer number (63067116).

Almost surely, 2^991054020 is an apocalyptic number.

It is an amenable number.

991054020 is an abundant number, since it is smaller than the sum of its proper divisors (2036167548).

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

991054020 is a wasteful number, since it uses less digits than its factorization.

991054020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1501620 (or 1501618 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 991054020 is about 31481.0104666289. The cubic root of 991054020 is about 997.0090699226.

The spelling of 991054020 in words is "nine hundred ninety-one million, fifty-four thousand, twenty".