2581192681 has 4 divisors (see below), whose sum is σ = 2612291472. Its totient is φ = 2550093892.

The previous prime is 2581192667. The next prime is 2581192721. The reversal of 2581192681 is 1862911852.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2581192681 - 2³¹ = 433709033 is a prime.

It is a super-2 number, since 2×2581192681² = 13325111312895935522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2581192651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15549271 + ... + 15549436.

It is an arithmetic number, because the mean of its divisors is an integer number (653072868).

Almost surely, 2^2581192681 is an apocalyptic number.

It is an amenable number.

2581192681 is a deficient number, since it is larger than the sum of its proper divisors (31098791).

2581192681 is an equidigital number, since it uses as much as digits as its factorization.

2581192681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31098790.

The product of its digits is 69120, while the sum is 43.

The square root of 2581192681 is about 50805.4394824019. The cubic root of 2581192681 is about 1371.7452815090.

The spelling of 2581192681 in words is "two billion, five hundred eighty-one million, one hundred ninety-two thousand, six hundred eighty-one".