61945543 has 4 divisors (see below), whose sum is σ = 67576968. Its totient is φ = 56314120.

The previous prime is 61945531. The next prime is 61945549. The reversal of 61945543 is 34554916.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61945543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61945549) 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, 2815696 + ... + 2815717.

It is an arithmetic number, because the mean of its divisors is an integer number (16894242).

Almost surely, 2^61945543 is an apocalyptic number.

61945543 is a deficient number, since it is larger than the sum of its proper divisors (5631425).

61945543 is a wasteful number, since it uses less digits than its factorization.

61945543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5631424.

The product of its digits is 64800, while the sum is 37.

The square root of 61945543 is about 7870.5490913913. The cubic root of 61945543 is about 395.6732480442.

The spelling of 61945543 in words is "sixty-one million, nine hundred forty-five thousand, five hundred forty-three".