2190406581 has 12 divisors (see below), whose sum is σ = 3451549920. Its totient is φ = 1327519080.

The previous prime is 2190406499. The next prime is 2190406607. The reversal of 2190406581 is 1856040912.

It is not a de Polignac number, because 2190406581 - 2⁹ = 2190406069 is a prime.

It is a super-2 number, since 2×2190406581² = 9595761980176219122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2190406481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11062561 + ... + 11062758.

It is an arithmetic number, because the mean of its divisors is an integer number (287629160).

Almost surely, 2^2190406581 is an apocalyptic number.

It is an amenable number.

2190406581 is a deficient number, since it is larger than the sum of its proper divisors (1261143339).

2190406581 is a wasteful number, since it uses less digits than its factorization.

2190406581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22125336 (or 22125333 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 2190406581 is about 46801.7796777003. The cubic root of 2190406581 is about 1298.6982197519.

The spelling of 2190406581 in words is "two billion, one hundred ninety million, four hundred six thousand, five hundred eighty-one".