61109645 has 8 divisors (see below), whose sum is σ = 77645304. Its totient is φ = 46011904.

The previous prime is 61109627. The next prime is 61109669. The reversal of 61109645 is 54690116.

It can be written as a sum of positive squares in 4 ways, for example, as 6895876 + 54213769 = 2626^2 + 7363^2 .

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 61109645 - 2²⁰ = 60061069 is a prime.

It is a super-3 number, since 3×61109645³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 359384 + ... + 359553.

It is an arithmetic number, because the mean of its divisors is an integer number (9705663).

Almost surely, 2^61109645 is an apocalyptic number.

It is an amenable number.

61109645 is a deficient number, since it is larger than the sum of its proper divisors (16535659).

61109645 is a wasteful number, since it uses less digits than its factorization.

61109645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718959.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 61109645 is about 7817.2658263615. The cubic root of 61109645 is about 393.8854335489.

The spelling of 61109645 in words is "sixty-one million, one hundred nine thousand, six hundred forty-five".