1901165220 has 36 divisors (see below), whose sum is σ = 5766868380. Its totient is φ = 506977344.

The previous prime is 1901165183. The next prime is 1901165239. The reversal of 1901165220 is 225611091.

1901165220 is a `hidden beast` number, since 1 + 9 + 0 + 1 + 1 + 652 + 2 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 815330916 + 1085834304 = 28554^2 + 32952^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1901165220² = 7228858387475296800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5280835 + ... + 5281194.

Almost surely, 2^1901165220 is an apocalyptic number.

1901165220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1901165220 is an abundant number, since it is smaller than the sum of its proper divisors (3865703160).

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

1901165220 is a wasteful number, since it uses less digits than its factorization.

1901165220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10562044 (or 10562039 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 1901165220 is about 43602.3533768534. The cubic root of 1901165220 is about 1238.8154704500.

The spelling of 1901165220 in words is "one billion, nine hundred one million, one hundred sixty-five thousand, two hundred twenty".