61389305 has 4 divisors (see below), whose sum is σ = 73667172. Its totient is φ = 49111440.

The previous prime is 61389287. The next prime is 61389319. The reversal of 61389305 is 50398316.

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 28430224 + 32959081 = 5332^2 + 5741^2 .

It is not a de Polignac number, because 61389305 - 2⁸ = 61389049 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6138926 + ... + 6138935.

It is an arithmetic number, because the mean of its divisors is an integer number (18416793).

Almost surely, 2^61389305 is an apocalyptic number.

It is an amenable number.

61389305 is a deficient number, since it is larger than the sum of its proper divisors (12277867).

61389305 is a wasteful number, since it uses less digits than its factorization.

61389305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12277866.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 61389305 is about 7835.1327365910. The cubic root of 61389305 is about 394.4853737128.

The spelling of 61389305 in words is "sixty-one million, three hundred eighty-nine thousand, three hundred five".