61286405 has 4 divisors (see below), whose sum is σ = 73543692. Its totient is φ = 49029120.

The previous prime is 61286399. The next prime is 61286429. The reversal of 61286405 is 50468216.

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 43864129 + 17422276 = 6623^2 + 4174^2 .

It is not a de Polignac number, because 61286405 - 2⁸ = 61286149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

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, 6128636 + ... + 6128645.

It is an arithmetic number, because the mean of its divisors is an integer number (18385923).

Almost surely, 2^61286405 is an apocalyptic number.

It is an amenable number.

61286405 is a deficient number, since it is larger than the sum of its proper divisors (12257287).

61286405 is a wasteful number, since it uses less digits than its factorization.

61286405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12257286.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 61286405 is about 7828.5634058874. The cubic root of 61286405 is about 394.2648399334.

The spelling of 61286405 in words is "sixty-one million, two hundred eighty-six thousand, four hundred five".