9161990 has 16 divisors (see below), whose sum is σ = 17359920. Its totient is φ = 3471840.

The previous prime is 9161987. The next prime is 9161993. The reversal of 9161990 is 991619.

It is an interprime number because it is at equal distance from previous prime (9161987) and next prime (9161993).

It is a self number, because there is not a number n which added to its sum of digits gives 9161990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9161993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23921 + ... + 24300.

It is an arithmetic number, because the mean of its divisors is an integer number (1084995).

Almost surely, 2^9161990 is an apocalyptic number.

9161990 is a deficient number, since it is larger than the sum of its proper divisors (8197930).

9161990 is a wasteful number, since it uses less digits than its factorization.

9161990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48247.

The product of its (nonzero) digits is 4374, while the sum is 35.

The square root of 9161990 is about 3026.8779294844. The cubic root of 9161990 is about 209.2489421640.

The spelling of 9161990 in words is "nine million, one hundred sixty-one thousand, nine hundred ninety".