61315145 has 4 divisors (see below), whose sum is σ = 73578180. Its totient is φ = 49052112.

The previous prime is 61315129. The next prime is 61315151. The reversal of 61315145 is 54151316.

61315145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20967241 + 40347904 = 4579^2 + 6352^2 .

It is a cyclic number.

It is not a de Polignac number, because 61315145 - 2⁴ = 61315129 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 6131510 + ... + 6131519.

It is an arithmetic number, because the mean of its divisors is an integer number (18394545).

Almost surely, 2^61315145 is an apocalyptic number.

It is an amenable number.

61315145 is a deficient number, since it is larger than the sum of its proper divisors (12263035).

61315145 is a wasteful number, since it uses less digits than its factorization.

61315145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12263034.

The product of its digits is 1800, while the sum is 26.

The square root of 61315145 is about 7830.3987765630. The cubic root of 61315145 is about 394.3264599111.

The spelling of 61315145 in words is "sixty-one million, three hundred fifteen thousand, one hundred forty-five".