145310553231521 has 4 divisors (see below), whose sum is σ = 148402267130112. Its totient is φ = 142218839332932.

The previous prime is 145310553231469. The next prime is 145310553231563. The reversal of 145310553231521 is 125132355013541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 145310553231521 - 2³⁴ = 145293373362337 is a prime.

It is a super-3 number, since 3×145310553231521³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (145310553231421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1545856949225 + ... + 1545856949318.

It is an arithmetic number, because the mean of its divisors is an integer number (37100566782528).

Almost surely, 2^{145310553231521} is an apocalyptic number.

It is an amenable number.

145310553231521 is a deficient number, since it is larger than the sum of its proper divisors (3091713898591).

145310553231521 is an equidigital number, since it uses as much as digits as its factorization.

145310553231521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3091713898590.

The product of its (nonzero) digits is 270000, while the sum is 41.

The spelling of 145310553231521 in words is "one hundred forty-five trillion, three hundred ten billion, five hundred fifty-three million, two hundred thirty-one thousand, five hundred twenty-one".