9381252781 has 4 divisors (see below), whose sum is σ = 9580853952. Its totient is φ = 9181651612.

The previous prime is 9381252773. The next prime is 9381252787. The reversal of 9381252781 is 1872521839.

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.

It is a cyclic number.

It is not a de Polignac number, because 9381252781 - 2³ = 9381252773 is a prime.

It is a super-2 number, since 2×9381252781² (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 (9381252787) 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, 99800515 + ... + 99800608.

It is an arithmetic number, because the mean of its divisors is an integer number (2395213488).

Almost surely, 2^9381252781 is an apocalyptic number.

It is an amenable number.

9381252781 is a deficient number, since it is larger than the sum of its proper divisors (199601171).

9381252781 is a wasteful number, since it uses less digits than its factorization.

9381252781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199601170.

The product of its digits is 241920, while the sum is 46.

The square root of 9381252781 is about 96856.8674952892. The cubic root of 9381252781 is about 2109.0503412723.

The spelling of 9381252781 in words is "nine billion, three hundred eighty-one million, two hundred fifty-two thousand, seven hundred eighty-one".