9881625917 has 4 divisors (see below), whose sum is σ = 9882745980. Its totient is φ = 9880505856.

The previous prime is 9881625899. The next prime is 9881625959. The reversal of 9881625917 is 7195261889.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7195261889 = 433 ⋅16617233.

It can be written as a sum of positive squares in 2 ways, for example, as 4007016601 + 5874609316 = 63301^2 + 76646^2 .

It is a cyclic number.

It is not a de Polignac number, because 9881625917 - 2⁸ = 9881625661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9881625997) 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, 546692 + ... + 564477.

It is an arithmetic number, because the mean of its divisors is an integer number (2470686495).

Almost surely, 2^9881625917 is an apocalyptic number.

It is an amenable number.

9881625917 is a deficient number, since it is larger than the sum of its proper divisors (1120063).

9881625917 is a wasteful number, since it uses less digits than its factorization.

9881625917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120062.

The product of its digits is 2177280, while the sum is 56.

The square root of 9881625917 is about 99406.3675877959. The cubic root of 9881625917 is about 2145.8999501559.

The spelling of 9881625917 in words is "nine billion, eight hundred eighty-one million, six hundred twenty-five thousand, nine hundred seventeen".