11901881 has 8 divisors (see below), whose sum is σ = 12120840. Its totient is φ = 11684992.

The previous prime is 11901821. The next prime is 11901899. The reversal of 11901881 is 18810911.

11901881 is digitally balanced in base 3, 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 4 ways, for example, as 477481 + 11424400 = 691^2 + 3380^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11901881 is a prime.

It is a super-2 number, since 2×11901881² = 283309542676322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11901811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15011 + ... + 15783.

It is an arithmetic number, because the mean of its divisors is an integer number (1515105).

Almost surely, 2^11901881 is an apocalyptic number.

It is an amenable number.

11901881 is a deficient number, since it is larger than the sum of its proper divisors (218959).

11901881 is an equidigital number, since it uses as much as digits as its factorization.

11901881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035.

The product of its (nonzero) digits is 576, while the sum is 29.

The square root of 11901881 is about 3449.9102886887. The cubic root of 11901881 is about 228.3171499473.

The spelling of 11901881 in words is "eleven million, nine hundred one thousand, eight hundred eighty-one".