61505943 has 4 divisors (see below), whose sum is σ = 82007928. Its totient is φ = 41003960.

The previous prime is 61505929. The next prime is 61505947. The reversal of 61505943 is 34950516.

It is a happy number.

61505943 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 61505943 - 2⁶ = 61505879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61505947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10250988 + ... + 10250993.

It is an arithmetic number, because the mean of its divisors is an integer number (20501982).

Almost surely, 2^61505943 is an apocalyptic number.

61505943 is a deficient number, since it is larger than the sum of its proper divisors (20501985).

61505943 is a wasteful number, since it uses less digits than its factorization.

61505943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20501984.

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 61505943 is about 7842.5724733661. The cubic root of 61505943 is about 394.7350527910.

The spelling of 61505943 in words is "sixty-one million, five hundred five thousand, nine hundred forty-three".