61073231621 has 4 divisors (see below), whose sum is σ = 62108371200. Its totient is φ = 60038092044.

The previous prime is 61073231591. The next prime is 61073231633. The reversal of 61073231621 is 12613237016.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61073231621 - 2¹⁰ = 61073230597 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 (61073231641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 517569701 + ... + 517569818.

It is an arithmetic number, because the mean of its divisors is an integer number (15527092800).

Almost surely, 2^61073231621 is an apocalyptic number.

It is an amenable number.

61073231621 is a deficient number, since it is larger than the sum of its proper divisors (1035139579).

61073231621 is a wasteful number, since it uses less digits than its factorization.

61073231621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035139578.

The product of its (nonzero) digits is 9072, while the sum is 32.

Adding to 61073231621 its reverse (12613237016), we get a palindrome (73686468637).

The spelling of 61073231621 in words is "sixty-one billion, seventy-three million, two hundred thirty-one thousand, six hundred twenty-one".