10309891 has 2 divisors, whose sum is σ = 10309892. Its totient is φ = 10309890.

The previous prime is 10309889. The next prime is 10309903. The reversal of 10309891 is 19890301.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 10309891 - 2¹ = 10309889 is a prime.

Together with 10309889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (10309801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5154945 + 5154946.

It is an arithmetic number, because the mean of its divisors is an integer number (5154946).

Almost surely, 2^10309891 is an apocalyptic number.

10309891 is a deficient number, since it is larger than the sum of its proper divisors (1).

10309891 is an equidigital number, since it uses as much as digits as its factorization.

10309891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 10309891 is about 3210.9018982211. The cubic root of 10309891 is about 217.6463347818.

The spelling of 10309891 in words is "ten million, three hundred nine thousand, eight hundred ninety-one".