10381661 has 2 divisors, whose sum is σ = 10381662. Its totient is φ = 10381660.

The previous prime is 10381607. The next prime is 10381667. The reversal of 10381661 is 16618301.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6100900 + 4280761 = 2470^2 + 2069^2 .

It is a cyclic number.

It is not a de Polignac number, because 10381661 - 2⁶ = 10381597 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10381661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10381667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5190830 + 5190831.

It is an arithmetic number, because the mean of its divisors is an integer number (5190831).

Almost surely, 2^10381661 is an apocalyptic number.

It is an amenable number.

10381661 is a deficient number, since it is larger than the sum of its proper divisors (1).

10381661 is an equidigital number, since it uses as much as digits as its factorization.

10381661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 10381661 is about 3222.0585035036. The cubic root of 10381661 is about 218.1501994953.

Adding to 10381661 its reverse (16618301), we get a palindrome (26999962).

The spelling of 10381661 in words is "ten million, three hundred eighty-one thousand, six hundred sixty-one".