8945661 has 4 divisors (see below), whose sum is σ = 11927552. Its totient is φ = 5963772.

The previous prime is 8945641. The next prime is 8945663. The reversal of 8945661 is 1665498.

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 8945661 - 2⁹ = 8945149 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8945663) 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, 1490941 + ... + 1490946.

It is an arithmetic number, because the mean of its divisors is an integer number (2981888).

Almost surely, 2^8945661 is an apocalyptic number.

It is an amenable number.

8945661 is a deficient number, since it is larger than the sum of its proper divisors (2981891).

8945661 is a wasteful number, since it uses less digits than its factorization.

8945661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2981890.

The product of its digits is 51840, while the sum is 39.

The square root of 8945661 is about 2990.9297885440. The cubic root of 8945661 is about 207.5889085294.

It can be divided in two parts, 894 and 5661, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 8945661 in words is "eight million, nine hundred forty-five thousand, six hundred sixty-one".