8161901 has 4 divisors (see below), whose sum is σ = 8903904. Its totient is φ = 7419900.

The previous prime is 8161889. The next prime is 8161903. The reversal of 8161901 is 1091618.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8161901 - 2⁶ = 8161837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8161903) 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 3 ways as a sum of consecutive naturals, for example, 370985 + ... + 371006.

It is an arithmetic number, because the mean of its divisors is an integer number (2225976).

Almost surely, 2^8161901 is an apocalyptic number.

It is an amenable number.

8161901 is a deficient number, since it is larger than the sum of its proper divisors (742003).

8161901 is a wasteful number, since it uses less digits than its factorization.

8161901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742002.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 8161901 is about 2856.9040935950. The cubic root of 8161901 is about 201.3401746015.

The spelling of 8161901 in words is "eight million, one hundred sixty-one thousand, nine hundred one".