2182154581 has 2 divisors, whose sum is σ = 2182154582. Its totient is φ = 2182154580.

The previous prime is 2182154549. The next prime is 2182154609. The reversal of 2182154581 is 1854512812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1445900625 + 736253956 = 38025^2 + 27134^2 .

It is a cyclic number.

It is not a de Polignac number, because 2182154581 - 2⁵ = 2182154549 is a prime.

It is a super-2 number, since 2×2182154581² = 9523597230758571122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2182154581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2182154501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1091077290 + 1091077291.

It is an arithmetic number, because the mean of its divisors is an integer number (1091077291).

Almost surely, 2^2182154581 is an apocalyptic number.

It is an amenable number.

2182154581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2182154581 is an equidigital number, since it uses as much as digits as its factorization.

2182154581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25600, while the sum is 37.

The square root of 2182154581 is about 46713.5374490094. The cubic root of 2182154581 is about 1297.0652894326.

The spelling of 2182154581 in words is "two billion, one hundred eighty-two million, one hundred fifty-four thousand, five hundred eighty-one".