9051661 has 4 divisors (see below), whose sum is σ = 9067324. Its totient is φ = 9036000.

The previous prime is 9051617. The next prime is 9051697. The reversal of 9051661 is 1661509.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1661509 = 191 ⋅8699.

It can be written as a sum of positive squares in 2 ways, for example, as 7322436 + 1729225 = 2706^2 + 1315^2 .

It is a cyclic number.

It is not a de Polignac number, because 9051661 - 2²³ = 663053 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 (9051061) 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, 6930 + ... + 8131.

It is an arithmetic number, because the mean of its divisors is an integer number (2266831).

Almost surely, 2^9051661 is an apocalyptic number.

It is an amenable number.

9051661 is a deficient number, since it is larger than the sum of its proper divisors (15663).

9051661 is a wasteful number, since it uses less digits than its factorization.

9051661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15662.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 9051661 is about 3008.5978461735. The cubic root of 9051661 is about 208.4056202841.

The spelling of 9051661 in words is "nine million, fifty-one thousand, six hundred sixty-one".