8190961 has 4 divisors (see below), whose sum is σ = 8199412. Its totient is φ = 8182512.

The previous prime is 8190953. The next prime is 8190979. The reversal of 8190961 is 1690918.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1690918 = 2 ⋅845459.

It can be written as a sum of positive squares in 2 ways, for example, as 176400 + 8014561 = 420^2 + 2831^2 .

It is a cyclic number.

It is not a de Polignac number, because 8190961 - 2³ = 8190953 is a prime.

It is a Duffinian number.

8190961 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8190901) 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, 2550 + ... + 4783.

It is an arithmetic number, because the mean of its divisors is an integer number (2049853).

Almost surely, 2^8190961 is an apocalyptic number.

It is an amenable number.

8190961 is a deficient number, since it is larger than the sum of its proper divisors (8451).

8190961 is a wasteful number, since it uses less digits than its factorization.

8190961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8450.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 8190961 is about 2861.9854996139. The cubic root of 8190961 is about 201.5788451100.

It can be divided in two parts, 8 and 190961, that added together give a square (190969 = 437²).

The spelling of 8190961 in words is "eight million, one hundred ninety thousand, nine hundred sixty-one".