61979743 has 4 divisors (see below), whose sum is σ = 70834000. Its totient is φ = 53125488.

The previous prime is 61979719. The next prime is 61979747. The reversal of 61979743 is 34797916.

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-61979743 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61979693 and 61979702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61979747) 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, 4427118 + ... + 4427131.

It is an arithmetic number, because the mean of its divisors is an integer number (17708500).

Almost surely, 2^61979743 is an apocalyptic number.

61979743 is a deficient number, since it is larger than the sum of its proper divisors (8854257).

61979743 is an equidigital number, since it uses as much as digits as its factorization.

61979743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8854256.

The product of its digits is 285768, while the sum is 46.

The square root of 61979743 is about 7872.7214481398. The cubic root of 61979743 is about 395.7460514284.

The spelling of 61979743 in words is "sixty-one million, nine hundred seventy-nine thousand, seven hundred forty-three".