921145519601 has 2 divisors, whose sum is σ = 921145519602. Its totient is φ = 921145519600.

The previous prime is 921145519583. The next prime is 921145519627. The reversal of 921145519601 is 106915541129.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 916720077025 + 4425442576 = 957455^2 + 66524^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-921145519601 is a prime.

It is not a weakly prime, because it can be changed into another prime (921145519201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460572759800 + 460572759801.

It is an arithmetic number, because the mean of its divisors is an integer number (460572759801).

Almost surely, 2^921145519601 is an apocalyptic number.

It is an amenable number.

921145519601 is a deficient number, since it is larger than the sum of its proper divisors (1).

921145519601 is an equidigital number, since it uses as much as digits as its factorization.

921145519601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 44.

The spelling of 921145519601 in words is "nine hundred twenty-one billion, one hundred forty-five million, five hundred nineteen thousand, six hundred one".