87194300621 has 2 divisors, whose sum is σ = 87194300622. Its totient is φ = 87194300620.

The previous prime is 87194300593. The next prime is 87194300651. The reversal of 87194300621 is 12600349178.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76832078596 + 10362222025 = 277186^2 + 101795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87194300621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87194300651) 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 as a sum of consecutive naturals, namely, 43597150310 + 43597150311.

It is an arithmetic number, because the mean of its divisors is an integer number (43597150311).

Almost surely, 2^87194300621 is an apocalyptic number.

It is an amenable number.

87194300621 is a deficient number, since it is larger than the sum of its proper divisors (1).

87194300621 is an equidigital number, since it uses as much as digits as its factorization.

87194300621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 41.

Adding to 87194300621 its reverse (12600349178), we get a palindrome (99794649799).

The spelling of 87194300621 in words is "eighty-seven billion, one hundred ninety-four million, three hundred thousand, six hundred twenty-one".