61360739521 has 3 divisors (see below), whose sum is σ = 61360987233. Its totient is φ = 61360491810.

The previous prime is 61360739519. The next prime is 61360739537. The reversal of 61360739521 is 12593706316.

The square root of 61360739521 is 247711.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 61360739521 - 2¹ = 61360739519 is a prime.

It is a super-2 number, since 2×61360739521² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61360739581) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 123856 + ... + 371566.

It is an arithmetic number, because the mean of its divisors is an integer number (20453662411).

Almost surely, 2^61360739521 is an apocalyptic number.

61360739521 is the 247711-st square number.

61360739521 is the 123856-th centered octagonal number.

It is an amenable number.

61360739521 is a deficient number, since it is larger than the sum of its proper divisors (247712).

61360739521 is an frugal number, since it uses more digits than its factorization.

61360739521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495422 (or 247711 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 43.

The spelling of 61360739521 in words is "sixty-one billion, three hundred sixty million, seven hundred thirty-nine thousand, five hundred twenty-one".