145011591 has 24 divisors (see below), whose sum is σ = 225189120. Its totient is φ = 89632656.

The previous prime is 145011569. The next prime is 145011599. The reversal of 145011591 is 195110541.

145011591 is a `hidden beast` number, since 1 + 4 + 501 + 159 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-145011591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145011599) 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 23 ways as a sum of consecutive naturals, for example, 985 + ... + 17058.

It is an arithmetic number, because the mean of its divisors is an integer number (9382880).

Almost surely, 2^145011591 is an apocalyptic number.

145011591 is a deficient number, since it is larger than the sum of its proper divisors (80177529).

145011591 is a wasteful number, since it uses less digits than its factorization.

145011591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18115 (or 18112 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 27.

The square root of 145011591 is about 12042.0758592528. The cubic root of 145011591 is about 525.3727855745.

It can be divided in two parts, 1450 and 11591, that added together give a triangular number (13041 = T₁₆₁).

The spelling of 145011591 in words is "one hundred forty-five million, eleven thousand, five hundred ninety-one".