105280391 has 2 divisors, whose sum is σ = 105280392. Its totient is φ = 105280390.

The previous prime is 105280339. The next prime is 105280447. The reversal of 105280391 is 193082501.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105280391 is a prime.

It is a super-2 number, since 2×105280391² = 22167921458225762, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (105280321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52640195 + 52640196.

It is an arithmetic number, because the mean of its divisors is an integer number (52640196).

Almost surely, 2^105280391 is an apocalyptic number.

105280391 is a deficient number, since it is larger than the sum of its proper divisors (1).

105280391 is an equidigital number, since it uses as much as digits as its factorization.

105280391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 105280391 is about 10260.6233241456. The cubic root of 105280391 is about 472.1889609565.

The spelling of 105280391 in words is "one hundred five million, two hundred eighty thousand, three hundred ninety-one".