145271881609 has 2 divisors, whose sum is σ = 145271881610. Its totient is φ = 145271881608.

The previous prime is 145271881577. The next prime is 145271881673. The reversal of 145271881609 is 906188172541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119990881609 + 25281000000 = 346397^2 + 159000^2 .

It is an emirp because it is prime and its reverse (906188172541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145271881609 - 2⁵ = 145271881577 is a prime.

It is a super-4 number, since 4×145271881609⁴ (a number of 46 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3, 2.

It is not a weakly prime, because it can be changed into another prime (145271885609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72635940804 + 72635940805.

It is an arithmetic number, because the mean of its divisors is an integer number (72635940805).

Almost surely, 2^145271881609 is an apocalyptic number.

It is an amenable number.

145271881609 is a deficient number, since it is larger than the sum of its proper divisors (1).

145271881609 is an equidigital number, since it uses as much as digits as its factorization.

145271881609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 967680, while the sum is 52.

The spelling of 145271881609 in words is "one hundred forty-five billion, two hundred seventy-one million, eight hundred eighty-one thousand, six hundred nine".