109644649 has 4 divisors (see below), whose sum is σ = 115415440. Its totient is φ = 103873860.

The previous prime is 109644643. The next prime is 109644659. The reversal of 109644649 is 946446901.

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: 946446901 = 661 ⋅1431841.

It is a cyclic number.

It is not a de Polignac number, because 109644649 - 2⁵ = 109644617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109644643) 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, 2885367 + ... + 2885404.

It is an arithmetic number, because the mean of its divisors is an integer number (28853860).

Almost surely, 2^109644649 is an apocalyptic number.

109644649 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

109644649 is a deficient number, since it is larger than the sum of its proper divisors (5770791).

109644649 is an equidigital number, since it uses as much as digits as its factorization.

109644649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5770790.

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 109644649 is about 10471.1340837562. The cubic root of 109644649 is about 478.6254788670.

It can be divided in two parts, 10964464 and 9, that multiplied together give a triangular number (98680176 = T₁₄₀₄₈).

The spelling of 109644649 in words is "one hundred nine million, six hundred forty-four thousand, six hundred forty-nine".