1445165231 has 4 divisors (see below), whose sum is σ = 1450382712. Its totient is φ = 1439947752.

The previous prime is 1445165221. The next prime is 1445165243. The reversal of 1445165231 is 1325615441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1325615441 = 173 ⋅7662517.

It is a cyclic number.

It is not a de Polignac number, because 1445165231 - 2⁶ = 1445165167 is a prime.

It is a super-2 number, since 2×1445165231² = 4177005089782566722, which 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 (1445165221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2608325 + ... + 2608878.

It is an arithmetic number, because the mean of its divisors is an integer number (362595678).

Almost surely, 2^1445165231 is an apocalyptic number.

1445165231 is a deficient number, since it is larger than the sum of its proper divisors (5217481).

1445165231 is an equidigital number, since it uses as much as digits as its factorization.

1445165231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5217480.

The product of its digits is 14400, while the sum is 32.

The square root of 1445165231 is about 38015.3288950655. The cubic root of 1445165231 is about 1130.5918091956.

The spelling of 1445165231 in words is "one billion, four hundred forty-five million, one hundred sixty-five thousand, two hundred thirty-one".