9931749987 has 4 divisors (see below), whose sum is σ = 13242333320. Its totient is φ = 6621166656.

The previous prime is 9931749941. The next prime is 9931750027. The reversal of 9931749987 is 7899471399.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 9931749987 - 2⁸ = 9931749731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9931249987) 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, 1655291662 + ... + 1655291667.

It is an arithmetic number, because the mean of its divisors is an integer number (3310583330).

Almost surely, 2^9931749987 is an apocalyptic number.

9931749987 is a deficient number, since it is larger than the sum of its proper divisors (3310583333).

9931749987 is a wasteful number, since it uses less digits than its factorization.

9931749987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3310583332.

The product of its digits is 30862944, while the sum is 66.

The square root of 9931749987 is about 99658.1656814935. The cubic root of 9931749987 is about 2149.5221571557.

The spelling of 9931749987 in words is "nine billion, nine hundred thirty-one million, seven hundred forty-nine thousand, nine hundred eighty-seven".