61291445 has 8 divisors (see below), whose sum is σ = 73595736. Its totient is φ = 49002496.

The previous prime is 61291441. The next prime is 61291453. The reversal of 61291445 is 54419216.

It can be written as a sum of positive squares in 4 ways, for example, as 33339076 + 27952369 = 5774^2 + 5287^2 .

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 61291445 - 2² = 61291441 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61291441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8669 + ... + 14061.

It is an arithmetic number, because the mean of its divisors is an integer number (9199467).

Almost surely, 2^61291445 is an apocalyptic number.

It is an amenable number.

61291445 is a deficient number, since it is larger than the sum of its proper divisors (12304291).

61291445 is a wasteful number, since it uses less digits than its factorization.

61291445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7671.

The product of its digits is 8640, while the sum is 32.

The square root of 61291445 is about 7828.8852974098. The cubic root of 61291445 is about 394.2756473348.

The spelling of 61291445 in words is "sixty-one million, two hundred ninety-one thousand, four hundred forty-five".