931889913 has 4 divisors (see below), whose sum is σ = 1242519888. Its totient is φ = 621259940.

The previous prime is 931889911. The next prime is 931889921. The reversal of 931889913 is 319988139.

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 931889913 - 2¹ = 931889911 is a prime.

It is a super-2 number, since 2×931889913² = 1736837619902295138, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (931889911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155314983 + ... + 155314988.

It is an arithmetic number, because the mean of its divisors is an integer number (310629972).

Almost surely, 2^931889913 is an apocalyptic number.

It is an amenable number.

931889913 is a deficient number, since it is larger than the sum of its proper divisors (310629975).

931889913 is a wasteful number, since it uses less digits than its factorization.

931889913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310629974.

The product of its digits is 419904, while the sum is 51.

The square root of 931889913 is about 30526.8719819113. The cubic root of 931889913 is about 976.7607588853.

The spelling of 931889913 in words is "nine hundred thirty-one million, eight hundred eighty-nine thousand, nine hundred thirteen".