10640381 has 2 divisors, whose sum is σ = 10640382. Its totient is φ = 10640380.

The previous prime is 10640369. The next prime is 10640387. The reversal of 10640381 is 18304601.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6400900 + 4239481 = 2530^2 + 2059^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10640381 is a prime.

It is a super-2 number, since 2×10640381² = 226435415650322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10640387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5320190 + 5320191.

It is an arithmetic number, because the mean of its divisors is an integer number (5320191).

Almost surely, 2^10640381 is an apocalyptic number.

It is an amenable number.

10640381 is a deficient number, since it is larger than the sum of its proper divisors (1).

10640381 is an equidigital number, since it uses as much as digits as its factorization.

10640381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 10640381 is about 3261.9596870593. The cubic root of 10640381 is about 219.9475150280.

Adding to 10640381 its reverse (18304601), we get a palindrome (28944982).

The spelling of 10640381 in words is "ten million, six hundred forty thousand, three hundred eighty-one".