109388621 has 4 divisors (see below), whose sum is σ = 114144672. Its totient is φ = 104632572.

The previous prime is 109388579. The next prime is 109388623. The reversal of 109388621 is 126883901.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 126883901 = 1193 ⋅106357.

It is a cyclic number.

It is not a de Polignac number, because 109388621 - 2¹⁸ = 109126477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109388623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2377991 + ... + 2378036.

It is an arithmetic number, because the mean of its divisors is an integer number (28536168).

Almost surely, 2^109388621 is an apocalyptic number.

It is an amenable number.

109388621 is a deficient number, since it is larger than the sum of its proper divisors (4756051).

109388621 is an equidigital number, since it uses as much as digits as its factorization.

109388621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4756050.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 109388621 is about 10458.9015197582. The cubic root of 109388621 is about 478.2526470867.

The spelling of 109388621 in words is "one hundred nine million, three hundred eighty-eight thousand, six hundred twenty-one".