61905643 has 4 divisors (see below), whose sum is σ = 63073728. Its totient is φ = 60737560.

The previous prime is 61905617. The next prime is 61905647. The reversal of 61905643 is 34650916.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61905643 - 2⁹ = 61905131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61905599 and 61905608.

It is not an unprimeable number, because it can be changed into a prime (61905647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 583963 + ... + 584068.

It is an arithmetic number, because the mean of its divisors is an integer number (15768432).

Almost surely, 2^61905643 is an apocalyptic number.

61905643 is a deficient number, since it is larger than the sum of its proper divisors (1168085).

61905643 is a wasteful number, since it uses less digits than its factorization.

61905643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1168084.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 61905643 is about 7868.0139171204. The cubic root of 61905643 is about 395.5882768869.

The spelling of 61905643 in words is "sixty-one million, nine hundred five thousand, six hundred forty-three".