61520743 has 4 divisors (see below), whose sum is σ = 61537360. Its totient is φ = 61504128.

The previous prime is 61520731. The next prime is 61520747. The reversal of 61520743 is 34702516.

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 61520743 - 2⁹ = 61520231 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 (61520747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46 + ... + 11092.

It is an arithmetic number, because the mean of its divisors is an integer number (15384340).

Almost surely, 2^61520743 is an apocalyptic number.

61520743 is a deficient number, since it is larger than the sum of its proper divisors (16617).

61520743 is a wasteful number, since it uses less digits than its factorization.

61520743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16616.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 61520743 is about 7843.5159845569. The cubic root of 61520743 is about 394.7667115758.

The spelling of 61520743 in words is "sixty-one million, five hundred twenty thousand, seven hundred forty-three".