901991991892 has 12 divisors (see below), whose sum is σ = 1578522175776. Its totient is φ = 450985655960.

The previous prime is 901991991883. The next prime is 901991991899. The reversal of 901991991892 is 298199199109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (901991991899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2387038 + ... + 2738965.

It is an arithmetic number, because the mean of its divisors is an integer number (131543514648).

Almost surely, 2^901991991892 is an apocalyptic number.

It is an amenable number.

901991991892 is a deficient number, since it is larger than the sum of its proper divisors (676530183884).

901991991892 is a wasteful number, since it uses less digits than its factorization.

901991991892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5169998 (or 5169996 counting only the distinct ones).

The product of its (nonzero) digits is 8503056, while the sum is 67.

The spelling of 901991991892 in words is "nine hundred one billion, nine hundred ninety-one million, nine hundred ninety-one thousand, eight hundred ninety-two".