145652191 has 4 divisors (see below), whose sum is σ = 145704312. Its totient is φ = 145600072.

The previous prime is 145652189. The next prime is 145652203. The reversal of 145652191 is 191256541.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191256541 = 7 ⋅27322363.

It is a cyclic number.

It is not a de Polignac number, because 145652191 - 2¹ = 145652189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145652161) 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, 21616 + ... + 27541.

It is an arithmetic number, because the mean of its divisors is an integer number (36426078).

Almost surely, 2^145652191 is an apocalyptic number.

145652191 is a deficient number, since it is larger than the sum of its proper divisors (52121).

145652191 is an equidigital number, since it uses as much as digits as its factorization.

145652191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52120.

The product of its digits is 10800, while the sum is 34.

The square root of 145652191 is about 12068.6449529349. The cubic root of 145652191 is about 526.1452742484.

The spelling of 145652191 in words is "one hundred forty-five million, six hundred fifty-two thousand, one hundred ninety-one".