1901009100 has 36 divisors (see below), whose sum is σ = 5500253864. Its totient is φ = 506935680.

The previous prime is 1901009093. The next prime is 1901009101. The reversal of 1901009100 is 19001091.

It is a super-2 number, since 2×1901009100² = 7227671196565620000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1901009101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3168049 + ... + 3168648.

Almost surely, 2^1901009100 is an apocalyptic number.

1901009100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1901009100 is an abundant number, since it is smaller than the sum of its proper divisors (3599244764).

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

1901009100 is a wasteful number, since it uses less digits than its factorization.

1901009100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6336714 (or 6336707 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 21.

The square root of 1901009100 is about 43600.5630697586. The cubic root of 1901009100 is about 1238.7815598140.

The spelling of 1901009100 in words is "one billion, nine hundred one million, nine thousand, one hundred".