10287661 has 2 divisors, whose sum is σ = 10287662. Its totient is φ = 10287660.

The previous prime is 10287643. The next prime is 10287709. The reversal of 10287661 is 16678201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7946761 + 2340900 = 2819^2 + 1530^2 .

It is an emirp because it is prime and its reverse (16678201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10287661 - 2¹³ = 10279469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10287611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5143830 + 5143831.

It is an arithmetic number, because the mean of its divisors is an integer number (5143831).

Almost surely, 2^10287661 is an apocalyptic number.

It is an amenable number.

10287661 is a deficient number, since it is larger than the sum of its proper divisors (1).

10287661 is an equidigital number, since it uses as much as digits as its factorization.

10287661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 10287661 is about 3207.4383860021. The cubic root of 10287661 is about 217.4897938576.

The spelling of 10287661 in words is "ten million, two hundred eighty-seven thousand, six hundred sixty-one".