10661939 has 2 divisors, whose sum is σ = 10661940. Its totient is φ = 10661938.

The previous prime is 10661929. The next prime is 10661971. The reversal of 10661939 is 93916601.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 10661939 - 2⁸ = 10661683 is a prime.

It is a super-2 number, since 2×10661939² = 227353886479442, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 10661899 and 10661908.

It is not a weakly prime, because it can be changed into another prime (10661929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5330969 + 5330970.

It is an arithmetic number, because the mean of its divisors is an integer number (5330970).

Almost surely, 2^10661939 is an apocalyptic number.

10661939 is a deficient number, since it is larger than the sum of its proper divisors (1).

10661939 is an equidigital number, since it uses as much as digits as its factorization.

10661939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 10661939 is about 3265.2624703077. The cubic root of 10661939 is about 220.0959567633.

The spelling of 10661939 in words is "ten million, six hundred sixty-one thousand, nine hundred thirty-nine".