9147449025581 has 2 divisors, whose sum is σ = 9147449025582. Its totient is φ = 9147449025580.

The previous prime is 9147449025557. The next prime is 9147449025607. The reversal of 9147449025581 is 1855209447419.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7390323805225 + 1757125220356 = 2718515^2 + 1325566^2 .

It is a cyclic number.

It is not a de Polignac number, because 9147449025581 - 2³⁴ = 9130269156397 is a prime.

It is a super-2 number, since 2×9147449025581² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9147449025581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9147449025551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4573724512790 + 4573724512791.

It is an arithmetic number, because the mean of its divisors is an integer number (4573724512791).

Almost surely, 2^{9147449025581} is an apocalyptic number.

It is an amenable number.

9147449025581 is a deficient number, since it is larger than the sum of its proper divisors (1).

9147449025581 is an equidigital number, since it uses as much as digits as its factorization.

9147449025581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14515200, while the sum is 59.

The spelling of 9147449025581 in words is "nine trillion, one hundred forty-seven billion, four hundred forty-nine million, twenty-five thousand, five hundred eighty-one".