105880721 has 2 divisors, whose sum is σ = 105880722. Its totient is φ = 105880720.

The previous prime is 105880679. The next prime is 105880727. The reversal of 105880721 is 127088501.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86862400 + 19018321 = 9320^2 + 4361^2 .

It is a cyclic number.

It is not a de Polignac number, because 105880721 - 2⁶ = 105880657 is a prime.

It is a super-2 number, since 2×105880721² = 22421454158959682, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (105880727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52940360 + 52940361.

It is an arithmetic number, because the mean of its divisors is an integer number (52940361).

Almost surely, 2^105880721 is an apocalyptic number.

It is an amenable number.

105880721 is a deficient number, since it is larger than the sum of its proper divisors (1).

105880721 is an equidigital number, since it uses as much as digits as its factorization.

105880721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 105880721 is about 10289.8358101575. The cubic root of 105880721 is about 473.0847659497.

It can be divided in two parts, 105880 and 721, that added together give a palindrome (106601).

The spelling of 105880721 in words is "one hundred five million, eight hundred eighty thousand, seven hundred twenty-one".