2493607581 has 6 divisors (see below), whose sum is σ = 3601877630. Its totient is φ = 1662405048.

The previous prime is 2493607579. The next prime is 2493607603. The reversal of 2493607581 is 1857063942.

2493607581 is a `hidden beast` number, since 2 + 4 + 9 + 3 + 60 + 7 + 581 = 666.

2493607581 is digitally balanced in base 2 and base 10, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1307907225 + 1185700356 = 36165^2 + 34434^2 .

It is not a de Polignac number, because 2493607581 - 2¹ = 2493607579 is a prime.

It is a super-2 number, since 2×2493607581² = 12436157536041343122, which contains 22 as substring.

It is a Duffinian number.

2493607581 is strictly pandigital in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2493607531) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 138533746 + ... + 138533763.

It is a 1-persistent number, because it is pandigital, but 2⋅2493607581 = 4987215162 is not.

Almost surely, 2^2493607581 is an apocalyptic number.

It is an amenable number.

2493607581 is a deficient number, since it is larger than the sum of its proper divisors (1108270049).

2493607581 is a wasteful number, since it uses less digits than its factorization.

2493607581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277067515 (or 277067512 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 2493607581 is about 49936.0348946530. The cubic root of 2493607581 is about 1356.0510412954.

The spelling of 2493607581 in words is "two billion, four hundred ninety-three million, six hundred seven thousand, five hundred eighty-one".