10169991 has 12 divisors (see below), whose sum is σ = 15820168. Its totient is φ = 6258384.

The previous prime is 10169987. The next prime is 10170023. The reversal of 10169991 is 19996101.

It is not a de Polignac number, because 10169991 - 2² = 10169987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10169491) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 43345 + ... + 43578.

Almost surely, 2^10169991 is an apocalyptic number.

10169991 is a deficient number, since it is larger than the sum of its proper divisors (5650177).

10169991 is a wasteful number, since it uses less digits than its factorization.

10169991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86942 (or 86939 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 36.

The square root of 10169991 is about 3189.0423327388. The cubic root of 10169991 is about 216.6573978941.

The spelling of 10169991 in words is "ten million, one hundred sixty-nine thousand, nine hundred ninety-one".