145189971 has 24 divisors (see below), whose sum is σ = 212696640. Its totient is φ = 95429376.

The previous prime is 145189969. The next prime is 145189999. The reversal of 145189971 is 179981541.

It is a happy number.

145189971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 145189971 - 2¹ = 145189969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (145189901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 373045 + ... + 373433.

It is an arithmetic number, because the mean of its divisors is an integer number (8862360).

Almost surely, 2^145189971 is an apocalyptic number.

145189971 is a deficient number, since it is larger than the sum of its proper divisors (67506669).

145189971 is a wasteful number, since it uses less digits than its factorization.

145189971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875 (or 872 counting only the distinct ones).

The product of its digits is 90720, while the sum is 45.

The square root of 145189971 is about 12049.4801132663. The cubic root of 145189971 is about 525.5881191583.

The spelling of 145189971 in words is "one hundred forty-five million, one hundred eighty-nine thousand, nine hundred seventy-one".