19910901010 has 64 divisors (see below), whose sum is σ = 48120355584. Its totient is φ = 5728608000.

The previous prime is 19910900969. The next prime is 19910901013. The reversal of 19910901010 is 1010901991.

It is not an unprimeable number, because it can be changed into a prime (19910901013) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 984541 + ... + 1004560.

It is an arithmetic number, because the mean of its divisors is an integer number (751880556).

Almost surely, 2^19910901010 is an apocalyptic number.

19910901010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19910901010 is an abundant number, since it is smaller than the sum of its proper divisors (28209454574).

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

19910901010 is a wasteful number, since it uses less digits than its factorization.

19910901010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1989139.

The product of its (nonzero) digits is 729, while the sum is 31.

The spelling of 19910901010 in words is "nineteen billion, nine hundred ten million, nine hundred one thousand, ten".