921445761601 has 2 divisors, whose sum is σ = 921445761602. Its totient is φ = 921445761600.

The previous prime is 921445761589. The next prime is 921445761617. The reversal of 921445761601 is 106167544129.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 774259206400 + 147186555201 = 879920^2 + 383649^2 .

It is an emirp because it is prime and its reverse (106167544129) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 921445761601 - 2¹⁷ = 921445630529 is a prime.

It is not a weakly prime, because it can be changed into another prime (921445761101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460722880800 + 460722880801.

It is an arithmetic number, because the mean of its divisors is an integer number (460722880801).

Almost surely, 2^921445761601 is an apocalyptic number.

It is an amenable number.

921445761601 is a deficient number, since it is larger than the sum of its proper divisors (1).

921445761601 is an equidigital number, since it uses as much as digits as its factorization.

921445761601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 921445761601 in words is "nine hundred twenty-one billion, four hundred forty-five million, seven hundred sixty-one thousand, six hundred one".