411091981 has 8 divisors (see below), whose sum is σ = 417287480. Its totient is φ = 404911872.

The previous prime is 411091973. The next prime is 411091991. The reversal of 411091981 is 189190114.

It can be written as a sum of positive squares in 4 ways, for example, as 22410756 + 388681225 = 4734^2 + 19715^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 411091981 - 2³ = 411091973 is a prime.

It is a super-2 number, since 2×411091981² = 337993233685008722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (411091921) 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, 57121 + ... + 63913.

It is an arithmetic number, because the mean of its divisors is an integer number (52160935).

Almost surely, 2^411091981 is an apocalyptic number.

It is an amenable number.

411091981 is a deficient number, since it is larger than the sum of its proper divisors (6195499).

411091981 is an equidigital number, since it uses as much as digits as its factorization.

411091981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7695.

The product of its (nonzero) digits is 2592, while the sum is 34.

The square root of 411091981 is about 20275.4033498720. The cubic root of 411091981 is about 743.5548345954.

The spelling of 411091981 in words is "four hundred eleven million, ninety-one thousand, nine hundred eighty-one".