61205915 has 4 divisors (see below), whose sum is σ = 73447104. Its totient is φ = 48964728.

The previous prime is 61205869. The next prime is 61205917. The reversal of 61205915 is 51950216.

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

It is a cyclic number.

It is not a de Polignac number, because 61205915 - 2¹⁶ = 61140379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61205917) 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 3 ways as a sum of consecutive naturals, for example, 6120587 + ... + 6120596.

It is an arithmetic number, because the mean of its divisors is an integer number (18361776).

Almost surely, 2^61205915 is an apocalyptic number.

61205915 is a deficient number, since it is larger than the sum of its proper divisors (12241189).

61205915 is a wasteful number, since it uses less digits than its factorization.

61205915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12241188.

The product of its (nonzero) digits is 2700, while the sum is 29.

The square root of 61205915 is about 7823.4209269347. The cubic root of 61205915 is about 394.0921628130.

The spelling of 61205915 in words is "sixty-one million, two hundred five thousand, nine hundred fifteen".