9991137025 has 6 divisors (see below), whose sum is σ = 12389009942. Its totient is φ = 7992909600.

The previous prime is 9991137019. The next prime is 9991137041. The reversal of 9991137025 is 5207311999.

It can be written as a sum of positive squares in 3 ways, for example, as 130051216 + 9861085809 = 11404^2 + 99303^2 .

It is not a de Polignac number, because 9991137025 - 2¹⁷ = 9991005953 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 199822716 + ... + 199822765.

Almost surely, 2^9991137025 is an apocalyptic number.

It is an amenable number.

9991137025 is a deficient number, since it is larger than the sum of its proper divisors (2397872917).

9991137025 is a wasteful number, since it uses less digits than its factorization.

9991137025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399645491 (or 399645486 counting only the distinct ones).

The product of its (nonzero) digits is 153090, while the sum is 46.

The square root of 9991137025 is about 99955.6753016056. The cubic root of 9991137025 is about 2153.7980118728.

The spelling of 9991137025 in words is "nine billion, nine hundred ninety-one million, one hundred thirty-seven thousand, twenty-five".