4087661 has 2 divisors, whose sum is σ = 4087662. Its totient is φ = 4087660.

The previous prime is 4087639. The next prime is 4087663. The reversal of 4087661 is 1667804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2910436 + 1177225 = 1706^2 + 1085^2 .

It is a cyclic number.

It is not a de Polignac number, because 4087661 - 2⁶ = 4087597 is a prime.

Together with 4087663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4087663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2043830 + 2043831.

It is an arithmetic number, because the mean of its divisors is an integer number (2043831).

Almost surely, 2^4087661 is an apocalyptic number.

It is an amenable number.

4087661 is a deficient number, since it is larger than the sum of its proper divisors (1).

4087661 is an equidigital number, since it uses as much as digits as its factorization.

4087661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 4087661 is about 2021.7964783825. The cubic root of 4087661 is about 159.8913455013.

The spelling of 4087661 in words is "four million, eighty-seven thousand, six hundred sixty-one".