109739521 has 16 divisors (see below), whose sum is σ = 116126784. Its totient is φ = 103581504.

The previous prime is 109739519. The next prime is 109739537. The reversal of 109739521 is 125937901.

It is not a de Polignac number, because 109739521 - 2¹ = 109739519 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109739551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 209566 + ... + 210088.

It is an arithmetic number, because the mean of its divisors is an integer number (7257924).

Almost surely, 2^109739521 is an apocalyptic number.

It is an amenable number.

109739521 is a deficient number, since it is larger than the sum of its proper divisors (6387263).

109739521 is a wasteful number, since it uses less digits than its factorization.

109739521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720.

The product of its (nonzero) digits is 17010, while the sum is 37.

The square root of 109739521 is about 10475.6632725570. The cubic root of 109739521 is about 478.7634854984.

The spelling of 109739521 in words is "one hundred nine million, seven hundred thirty-nine thousand, five hundred twenty-one".