290691004081 has 4 divisors (see below), whose sum is σ = 290819120500. Its totient is φ = 290562887664.

The previous prime is 290691004067. The next prime is 290691004091. The reversal of 290691004081 is 180400196092.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57996680625 + 232694323456 = 240825^2 + 482384^2 .

It is a cyclic number.

It is not a de Polignac number, because 290691004081 - 2²¹ = 290688906929 is a prime.

It is a super-2 number, since 2×290691004081² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (290691004091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64054806 + ... + 64059343.

It is an arithmetic number, because the mean of its divisors is an integer number (72704780125).

Almost surely, 2^290691004081 is an apocalyptic number.

It is an amenable number.

290691004081 is a deficient number, since it is larger than the sum of its proper divisors (128116419).

290691004081 is a wasteful number, since it uses less digits than its factorization.

290691004081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128116418.

The product of its (nonzero) digits is 31104, while the sum is 40.

The spelling of 290691004081 in words is "two hundred ninety billion, six hundred ninety-one million, four thousand, eighty-one".