9249856381 has 4 divisors (see below), whose sum is σ = 9297783292. Its totient is φ = 9201929472.

The previous prime is 9249856379. The next prime is 9249856411. The reversal of 9249856381 is 1836589429.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1836589429 = 20663 ⋅88883.

It can be written as a sum of positive squares in 2 ways, for example, as 2121431481 + 7128424900 = 46059^2 + 84430^2 .

It is a cyclic number.

It is not a de Polignac number, because 9249856381 - 2¹ = 9249856379 is a prime.

It is a super-2 number, since 2×9249856381² (a number of 21 digits) 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 (9249856321) 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, 23963166 + ... + 23963551.

It is an arithmetic number, because the mean of its divisors is an integer number (2324445823).

Almost surely, 2^9249856381 is an apocalyptic number.

It is an amenable number.

9249856381 is a deficient number, since it is larger than the sum of its proper divisors (47926911).

9249856381 is a wasteful number, since it uses less digits than its factorization.

9249856381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47926910.

The product of its digits is 3732480, while the sum is 55.

The square root of 9249856381 is about 96176.1736658306. The cubic root of 9249856381 is about 2099.1573626879.

The spelling of 9249856381 in words is "nine billion, two hundred forty-nine million, eight hundred fifty-six thousand, three hundred eighty-one".