90340181 has 4 divisors (see below), whose sum is σ = 91169100. Its totient is φ = 89511264.

The previous prime is 90340163. The next prime is 90340183. The reversal of 90340181 is 18104309.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18104309 = 3457 ⋅5237.

It can be written as a sum of positive squares in 2 ways, for example, as 44222500 + 46117681 = 6650^2 + 6791^2 .

It is a cyclic number.

It is not a de Polignac number, because 90340181 - 2¹⁰ = 90339157 is a prime.

It is a super-2 number, since 2×90340181² = 16322696606225522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 90340181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90340183) 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, 414296 + ... + 414513.

It is an arithmetic number, because the mean of its divisors is an integer number (22792275).

Almost surely, 2^90340181 is an apocalyptic number.

90340181 is the 5081-st centered heptagonal number.

It is an amenable number.

90340181 is a deficient number, since it is larger than the sum of its proper divisors (828919).

90340181 is a wasteful number, since it uses less digits than its factorization.

90340181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828918.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 90340181 is about 9504.7451833282. The cubic root of 90340181 is about 448.7043902197.

The spelling of 90340181 in words is "ninety million, three hundred forty thousand, one hundred eighty-one".