90641881 has 4 divisors (see below), whose sum is σ = 98882064. Its totient is φ = 82401700.

The previous prime is 90641869. The next prime is 90641891. The reversal of 90641881 is 18814609.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18814609 = 11 ⋅1710419.

It is a cyclic number.

It is not a de Polignac number, because 90641881 - 2¹³ = 90633689 is a prime.

It is a super-2 number, since 2×90641881² = 16431901182436322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90641881.

It is not an unprimeable number, because it can be changed into a prime (90641801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4120075 + ... + 4120096.

It is an arithmetic number, because the mean of its divisors is an integer number (24720516).

Almost surely, 2^90641881 is an apocalyptic number.

It is an amenable number.

90641881 is a deficient number, since it is larger than the sum of its proper divisors (8240183).

90641881 is a wasteful number, since it uses less digits than its factorization.

90641881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8240182.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 90641881 is about 9520.6029746020. The cubic root of 90641881 is about 449.2033328223.

The spelling of 90641881 in words is "ninety million, six hundred forty-one thousand, eight hundred eighty-one".