4251661 has 4 divisors (see below), whose sum is σ = 4398300. Its totient is φ = 4105024.

The previous prime is 4251647. The next prime is 4251691. The reversal of 4251661 is 1661524.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3261636 + 990025 = 1806^2 + 995^2 .

It is a cyclic number.

It is not a de Polignac number, because 4251661 - 2⁵ = 4251629 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 (4251601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73276 + ... + 73333.

It is an arithmetic number, because the mean of its divisors is an integer number (1099575).

Almost surely, 2^4251661 is an apocalyptic number.

It is an amenable number.

4251661 is a deficient number, since it is larger than the sum of its proper divisors (146639).

4251661 is a wasteful number, since it uses less digits than its factorization.

4251661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146638.

The product of its digits is 1440, while the sum is 25.

The square root of 4251661 is about 2061.9556251287. The cubic root of 4251661 is about 162.0016892574.

The spelling of 4251661 in words is "four million, two hundred fifty-one thousand, six hundred sixty-one".