109390621 has 2 divisors, whose sum is σ = 109390622. Its totient is φ = 109390620.

The previous prime is 109390613. The next prime is 109390627. The reversal of 109390621 is 126093901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79905721 + 29484900 = 8939^2 + 5430^2 .

It is a cyclic number.

It is not a de Polignac number, because 109390621 - 2³ = 109390613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109390627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54695310 + 54695311.

It is an arithmetic number, because the mean of its divisors is an integer number (54695311).

Almost surely, 2^109390621 is an apocalyptic number.

It is an amenable number.

109390621 is a deficient number, since it is larger than the sum of its proper divisors (1).

109390621 is an equidigital number, since it uses as much as digits as its factorization.

109390621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 109390621 is about 10458.9971316566. The cubic root of 109390621 is about 478.2555617697.

It can be divided in two parts, 109390 and 621, that added together give a palindrome (110011).

The spelling of 109390621 in words is "one hundred nine million, three hundred ninety thousand, six hundred twenty-one".