61215445 has 8 divisors (see below), whose sum is σ = 75167136. Its totient is φ = 47833296.

The previous prime is 61215437. The next prime is 61215499. The reversal of 61215445 is 54451216.

61215445 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 61215445 - 2³ = 61215437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142147 + ... + 142576.

It is an arithmetic number, because the mean of its divisors is an integer number (9395892).

Almost surely, 2^61215445 is an apocalyptic number.

It is an amenable number.

61215445 is a deficient number, since it is larger than the sum of its proper divisors (13951691).

61215445 is a wasteful number, since it uses less digits than its factorization.

61215445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284771.

The product of its digits is 4800, while the sum is 28.

The square root of 61215445 is about 7824.0299718240. The cubic root of 61215445 is about 394.1126156478.

The spelling of 61215445 in words is "sixty-one million, two hundred fifteen thousand, four hundred forty-five".