901909881 has 12 divisors (see below), whose sum is σ = 1306496100. Its totient is φ = 599548320.

The previous prime is 901909871. The next prime is 901909909. The reversal of 901909881 is 188909109.

901909881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 752679225 + 149230656 = 27435^2 + 12216^2 .

It is not a de Polignac number, because 901909881 - 2⁵ = 901909849 is a prime.

It is a super-2 number, since 2×901909881² = 1626882866890868322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (901909861) 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, 140430 + ... + 146711.

It is an arithmetic number, because the mean of its divisors is an integer number (108874675).

Almost surely, 2^901909881 is an apocalyptic number.

It is an amenable number.

901909881 is a deficient number, since it is larger than the sum of its proper divisors (404586219).

901909881 is a wasteful number, since it uses less digits than its factorization.

901909881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287496 (or 287493 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 45.

The square root of 901909881 is about 30031.8144806470. The cubic root of 901909881 is about 966.1718538687.

The spelling of 901909881 in words is "nine hundred one million, nine hundred nine thousand, eight hundred eighty-one".