2564964181 has 4 divisors (see below), whose sum is σ = 2762269132. Its totient is φ = 2367659232.

The previous prime is 2564964169. The next prime is 2564964191. The reversal of 2564964181 is 1814694652.

It is a happy number.

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 761263281 + 1803700900 = 27591^2 + 42470^2 .

It is a cyclic number.

It is not a de Polignac number, because 2564964181 - 2¹³ = 2564955989 is a prime.

It is a super-2 number, since 2×2564964181² = 13158082499626001522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2564964121) 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 3 ways as a sum of consecutive naturals, for example, 98652456 + ... + 98652481.

It is an arithmetic number, because the mean of its divisors is an integer number (690567283).

Almost surely, 2^2564964181 is an apocalyptic number.

It is an amenable number.

2564964181 is a deficient number, since it is larger than the sum of its proper divisors (197304951).

2564964181 is a wasteful number, since it uses less digits than its factorization.

2564964181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197304950.

The product of its digits is 414720, while the sum is 46.

The square root of 2564964181 is about 50645.4754247603. The cubic root of 2564964181 is about 1368.8644187108.

It can be divided in two parts, 2564 and 964181, that added together give a triangular number (966745 = T₁₃₉₀).

The spelling of 2564964181 in words is "two billion, five hundred sixty-four million, nine hundred sixty-four thousand, one hundred eighty-one".