4200661 has 2 divisors, whose sum is σ = 4200662. Its totient is φ = 4200660.

The previous prime is 4200629. The next prime is 4200671. The reversal of 4200661 is 1660024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3802500 + 398161 = 1950^2 + 631^2 .

It is a cyclic number.

It is not a de Polignac number, because 4200661 - 2⁵ = 4200629 is a prime.

4200661 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4200601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2100330 + 2100331.

It is an arithmetic number, because the mean of its divisors is an integer number (2100331).

Almost surely, 2^4200661 is an apocalyptic number.

It is an amenable number.

4200661 is a deficient number, since it is larger than the sum of its proper divisors (1).

4200661 is an equidigital number, since it uses as much as digits as its factorization.

4200661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 4200661 is about 2049.5514143344. The cubic root of 4200661 is about 161.3513282564.

Adding to 4200661 its reverse (1660024), we get a palindrome (5860685).

The spelling of 4200661 in words is "four million, two hundred thousand, six hundred sixty-one".