8349257581 has 4 divisors (see below), whose sum is σ = 9542008672. Its totient is φ = 7156506492.

The previous prime is 8349257561. The next prime is 8349257593. The reversal of 8349257581 is 1857529438.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1857529438 = 2 ⋅928764719.

It is a cyclic number.

It is not a de Polignac number, because 8349257581 - 2⁹ = 8349257069 is a prime.

It is a super-2 number, since 2×8349257581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8349257561) 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, 596375535 + ... + 596375548.

It is an arithmetic number, because the mean of its divisors is an integer number (2385502168).

Almost surely, 2^8349257581 is an apocalyptic number.

It is an amenable number.

8349257581 is a deficient number, since it is larger than the sum of its proper divisors (1192751091).

8349257581 is a wasteful number, since it uses less digits than its factorization.

8349257581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1192751090.

The product of its digits is 2419200, while the sum is 52.

The square root of 8349257581 is about 91374.2719861559. The cubic root of 8349257581 is about 2028.6912366972.

The spelling of 8349257581 in words is "eight billion, three hundred forty-nine million, two hundred fifty-seven thousand, five hundred eighty-one".