61105145 has 4 divisors (see below), whose sum is σ = 73326180. Its totient is φ = 48884112.

The previous prime is 61105127. The next prime is 61105147. The reversal of 61105145 is 54150116.

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 37650496 + 23454649 = 6136^2 + 4843^2 .

It is a cyclic number.

It is not a de Polignac number, because 61105145 - 2⁸ = 61104889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61105145.

It is not an unprimeable number, because it can be changed into a prime (61105147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6110510 + ... + 6110519.

It is an arithmetic number, because the mean of its divisors is an integer number (18331545).

Almost surely, 2^61105145 is an apocalyptic number.

It is an amenable number.

61105145 is a deficient number, since it is larger than the sum of its proper divisors (12221035).

61105145 is a wasteful number, since it uses less digits than its factorization.

61105145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12221034.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 61105145 is about 7816.9779966429. The cubic root of 61105145 is about 393.8757649826.

The spelling of 61105145 in words is "sixty-one million, one hundred five thousand, one hundred forty-five".