61227905 has 4 divisors (see below), whose sum is σ = 73473492. Its totient is φ = 48982320.

The previous prime is 61227893. The next prime is 61227913. The reversal of 61227905 is 50972216.

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 40806544 + 20421361 = 6388^2 + 4519^2 .

It is not a de Polignac number, because 61227905 - 2⁴ = 61227889 is a prime.

It is a Duffinian 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, 6122786 + ... + 6122795.

It is an arithmetic number, because the mean of its divisors is an integer number (18368373).

Almost surely, 2^61227905 is an apocalyptic number.

It is an amenable number.

61227905 is a deficient number, since it is larger than the sum of its proper divisors (12245587).

61227905 is a wasteful number, since it uses less digits than its factorization.

61227905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12245586.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 61227905 is about 7824.8261961529. The cubic root of 61227905 is about 394.1393535081.

The spelling of 61227905 in words is "sixty-one million, two hundred twenty-seven thousand, nine hundred five".