10639891 has 2 divisors, whose sum is σ = 10639892. Its totient is φ = 10639890.

The previous prime is 10639879. The next prime is 10639903. The reversal of 10639891 is 19893601.

It is a balanced prime because it is at equal distance from previous prime (10639879) and next prime (10639903).

It is a cyclic number.

It is not a de Polignac number, because 10639891 - 2⁵ = 10639859 is a prime.

It is a super-2 number, since 2×10639891² = 226414560983762, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 10639891.

It is not a weakly prime, because it can be changed into another prime (10639691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5319945 + 5319946.

It is an arithmetic number, because the mean of its divisors is an integer number (5319946).

Almost surely, 2^10639891 is an apocalyptic number.

10639891 is a deficient number, since it is larger than the sum of its proper divisors (1).

10639891 is an equidigital number, since it uses as much as digits as its factorization.

10639891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 10639891 is about 3261.8845779702. The cubic root of 10639891 is about 219.9441387097.

The spelling of 10639891 in words is "ten million, six hundred thirty-nine thousand, eight hundred ninety-one".