61917705 has 12 divisors (see below), whose sum is σ = 107324100. Its totient is φ = 33022752.

The previous prime is 61917683. The next prime is 61917731. The reversal of 61917705 is 50771916.

It can be written as a sum of positive squares in 2 ways, for example, as 31843449 + 30074256 = 5643^2 + 5484^2 .

It is not a de Polignac number, because 61917705 - 2⁵ = 61917673 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61917705.

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 11 ways as a sum of consecutive naturals, for example, 687930 + ... + 688019.

It is an arithmetic number, because the mean of its divisors is an integer number (8943675).

Almost surely, 2^61917705 is an apocalyptic number.

It is an amenable number.

61917705 is a deficient number, since it is larger than the sum of its proper divisors (45406395).

61917705 is a wasteful number, since it uses less digits than its factorization.

61917705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375960 (or 1375957 counting only the distinct ones).

The product of its (nonzero) digits is 13230, while the sum is 36.

The square root of 61917705 is about 7868.7804010533. The cubic root of 61917705 is about 395.6139680070.

The spelling of 61917705 in words is "sixty-one million, nine hundred seventeen thousand, seven hundred five".