109001661 has 4 divisors (see below), whose sum is σ = 145335552. Its totient is φ = 72667772.

The previous prime is 109001621. The next prime is 109001663. The reversal of 109001661 is 166100901.

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: 166100901 = 3 ⋅55366967.

It is a cyclic number.

It is not a de Polignac number, because 109001661 - 2⁶ = 109001597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109001663) 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, 18166941 + ... + 18166946.

It is an arithmetic number, because the mean of its divisors is an integer number (36333888).

Almost surely, 2^109001661 is an apocalyptic number.

It is an amenable number.

109001661 is a deficient number, since it is larger than the sum of its proper divisors (36333891).

109001661 is an equidigital number, since it uses as much as digits as its factorization.

109001661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36333890.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 109001661 is about 10440.3860560805. The cubic root of 109001661 is about 477.6880445004.

It can be divided in two parts, 10900 and 1661, that added together give a triangular number (12561 = T₁₅₈).

The spelling of 109001661 in words is "one hundred nine million, one thousand, six hundred sixty-one".