109971661 has 8 divisors (see below), whose sum is σ = 112235544. Its totient is φ = 107714880.

The previous prime is 109971643. The next prime is 109971679. The reversal of 109971661 is 166179901.

It is an interprime number because it is at equal distance from previous prime (109971643) and next prime (109971679).

It can be written as a sum of positive squares in 4 ways, for example, as 21799561 + 88172100 = 4669^2 + 9390^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 109971661 - 2¹⁷ = 109840589 is a prime.

It is a super-3 number, since 3×109971661³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109971461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38751 + ... + 41491.

It is an arithmetic number, because the mean of its divisors is an integer number (14029443).

Almost surely, 2^109971661 is an apocalyptic number.

It is an amenable number.

109971661 is a deficient number, since it is larger than the sum of its proper divisors (2263883).

109971661 is an equidigital number, since it uses as much as digits as its factorization.

109971661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3551.

The product of its (nonzero) digits is 20412, while the sum is 40.

The square root of 109971661 is about 10486.7373858603. The cubic root of 109971661 is about 479.1008354913.

The spelling of 109971661 in words is "one hundred nine million, nine hundred seventy-one thousand, six hundred sixty-one".