61511943 has 4 divisors (see below), whose sum is σ = 82015928. Its totient is φ = 41007960.

The previous prime is 61511941. The next prime is 61511951. The reversal of 61511943 is 34911516.

61511943 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 not a de Polignac number, because 61511943 - 2¹ = 61511941 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61511943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61511941) 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, 10251988 + ... + 10251993.

It is an arithmetic number, because the mean of its divisors is an integer number (20503982).

Almost surely, 2^61511943 is an apocalyptic number.

61511943 is a deficient number, since it is larger than the sum of its proper divisors (20503985).

61511943 is a wasteful number, since it uses less digits than its factorization.

61511943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20503984.

The product of its digits is 3240, while the sum is 30.

The square root of 61511943 is about 7842.9549915832. The cubic root of 61511943 is about 394.7478880455.

The spelling of 61511943 in words is "sixty-one million, five hundred eleven thousand, nine hundred forty-three".