61743561 has 8 divisors (see below), whose sum is σ = 89808864. Its totient is φ = 37420320.

The previous prime is 61743553. The next prime is 61743587. The reversal of 61743561 is 16534716.

61743561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61743561 - 2³ = 61743553 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 1871017 = 61743561 / (6 + 1 + 7 + 4 + 3 + 5 + 6 + 1).

It is not an unprimeable number, because it can be changed into a prime (61743511) 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 7 ways as a sum of consecutive naturals, for example, 935476 + ... + 935541.

It is an arithmetic number, because the mean of its divisors is an integer number (11226108).

Almost surely, 2^61743561 is an apocalyptic number.

It is an amenable number.

61743561 is a deficient number, since it is larger than the sum of its proper divisors (28065303).

61743561 is a wasteful number, since it uses less digits than its factorization.

61743561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1871031.

The product of its digits is 15120, while the sum is 33.

The square root of 61743561 is about 7857.7071083109. The cubic root of 61743561 is about 395.2427306898.

The spelling of 61743561 in words is "sixty-one million, seven hundred forty-three thousand, five hundred sixty-one".