61347145 has 4 divisors (see below), whose sum is σ = 73616580. Its totient is φ = 49077712.

The previous prime is 61347127. The next prime is 61347191. The reversal of 61347145 is 54174316.

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 8173881 + 53173264 = 2859^2 + 7292^2 .

It is a cyclic number.

It is not a de Polignac number, because 61347145 - 2⁷ = 61347017 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6134710 + ... + 6134719.

It is an arithmetic number, because the mean of its divisors is an integer number (18404145).

Almost surely, 2^61347145 is an apocalyptic number.

It is an amenable number.

61347145 is a deficient number, since it is larger than the sum of its proper divisors (12269435).

61347145 is a wasteful number, since it uses less digits than its factorization.

61347145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12269434.

The product of its digits is 10080, while the sum is 31.

The square root of 61347145 is about 7832.4418287020. The cubic root of 61347145 is about 394.3950468385.

The spelling of 61347145 in words is "sixty-one million, three hundred forty-seven thousand, one hundred forty-five".