90687227621 has 2 divisors, whose sum is σ = 90687227622. Its totient is φ = 90687227620.

The previous prime is 90687227593. The next prime is 90687227623. The reversal of 90687227621 is 12672278609.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54644205121 + 36043022500 = 233761^2 + 189850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90687227621 is a prime.

Together with 90687227623, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90687227621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90687227623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45343613810 + 45343613811.

It is an arithmetic number, because the mean of its divisors is an integer number (45343613811).

Almost surely, 2^90687227621 is an apocalyptic number.

It is an amenable number.

90687227621 is a deficient number, since it is larger than the sum of its proper divisors (1).

90687227621 is an equidigital number, since it uses as much as digits as its factorization.

90687227621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The spelling of 90687227621 in words is "ninety billion, six hundred eighty-seven million, two hundred twenty-seven thousand, six hundred twenty-one".