145591009231 has 4 divisors (see below), whose sum is σ = 145821740464. Its totient is φ = 145360278000.

The previous prime is 145591009199. The next prime is 145591009247. The reversal of 145591009231 is 132900195541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132900195541 = 109 ⋅1219267849.

It is a cyclic number.

It is not a de Polignac number, because 145591009231 - 2⁵ = 145591009199 is a prime.

It is a super-2 number, since 2×145591009231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145591009271) 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, 115364670 + ... + 115365931.

It is an arithmetic number, because the mean of its divisors is an integer number (36455435116).

Almost surely, 2^145591009231 is an apocalyptic number.

145591009231 is a deficient number, since it is larger than the sum of its proper divisors (230731233).

145591009231 is an equidigital number, since it uses as much as digits as its factorization.

145591009231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230731232.

The product of its (nonzero) digits is 48600, while the sum is 40.

The spelling of 145591009231 in words is "one hundred forty-five billion, five hundred ninety-one million, nine thousand, two hundred thirty-one".