145128591 has 28 divisors (see below), whose sum is σ = 218801112. Its totient is φ = 96216336.

The previous prime is 145128583. The next prime is 145128601. The reversal of 145128591 is 195821541.

145128591 is a `hidden beast` number, since 1 + 45 + 1 + 28 + 591 = 666.

It is not a de Polignac number, because 145128591 - 2³ = 145128583 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145128491) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 165045 + ... + 165921.

Almost surely, 2^145128591 is an apocalyptic number.

145128591 is a deficient number, since it is larger than the sum of its proper divisors (73672521).

145128591 is an frugal number, since it uses more digits than its factorization.

145128591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122 (or 1107 counting only the distinct ones).

The product of its digits is 14400, while the sum is 36.

The square root of 145128591 is about 12046.9328461646. The cubic root of 145128591 is about 525.5140434589.

The spelling of 145128591 in words is "one hundred forty-five million, one hundred twenty-eight thousand, five hundred ninety-one".