145122187 has 4 divisors (see below), whose sum is σ = 165853936. Its totient is φ = 124390440.

The previous prime is 145122181. The next prime is 145122223. The reversal of 145122187 is 781221541.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 145122187 - 2³ = 145122179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145122181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10365864 + ... + 10365877.

It is an arithmetic number, because the mean of its divisors is an integer number (41463484).

Almost surely, 2^145122187 is an apocalyptic number.

145122187 is a deficient number, since it is larger than the sum of its proper divisors (20731749).

145122187 is an equidigital number, since it uses as much as digits as its factorization.

145122187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20731748.

The product of its digits is 4480, while the sum is 31.

The square root of 145122187 is about 12046.6670494374. The cubic root of 145122187 is about 525.5063136670.

The spelling of 145122187 in words is "one hundred forty-five million, one hundred twenty-two thousand, one hundred eighty-seven".