61307905 has 4 divisors (see below), whose sum is σ = 73569492. Its totient is φ = 49046320.

The previous prime is 61307891. The next prime is 61307923. The reversal of 61307905 is 50970316.

61307905 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 38229489 + 23078416 = 6183^2 + 4804^2 .

It is not a de Polignac number, because 61307905 - 2¹⁹ = 60783617 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

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, 6130786 + ... + 6130795.

It is an arithmetic number, because the mean of its divisors is an integer number (18392373).

Almost surely, 2^61307905 is an apocalyptic number.

It is an amenable number.

61307905 is a deficient number, since it is larger than the sum of its proper divisors (12261587).

61307905 is a wasteful number, since it uses less digits than its factorization.

61307905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12261586.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 61307905 is about 7829.9364620666. The cubic root of 61307905 is about 394.3109388087.

The spelling of 61307905 in words is "sixty-one million, three hundred seven thousand, nine hundred five".