8351661 has 4 divisors (see below), whose sum is σ = 11135552. Its totient is φ = 5567772.

The previous prime is 8351639. The next prime is 8351663. The reversal of 8351661 is 1661538.

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 not a de Polignac number, because 8351661 - 2⁶ = 8351597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8351663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1391941 + ... + 1391946.

It is an arithmetic number, because the mean of its divisors is an integer number (2783888).

Almost surely, 2^8351661 is an apocalyptic number.

It is an amenable number.

8351661 is a deficient number, since it is larger than the sum of its proper divisors (2783891).

8351661 is a wasteful number, since it uses less digits than its factorization.

8351661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2783890.

The product of its digits is 4320, while the sum is 30.

The square root of 8351661 is about 2889.9240474448. The cubic root of 8351661 is about 202.8885877847. Note that the first 3 decimals are identical.

The spelling of 8351661 in words is "eight million, three hundred fifty-one thousand, six hundred sixty-one".