145597091 has 4 divisors (see below), whose sum is σ = 145700832. Its totient is φ = 145493352.

The previous prime is 145597087. The next prime is 145597093. The reversal of 145597091 is 190795541.

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 145597091 - 2² = 145597087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145597093) 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, 49736 + ... + 52581.

It is an arithmetic number, because the mean of its divisors is an integer number (36425208).

Almost surely, 2^145597091 is an apocalyptic number.

145597091 is a deficient number, since it is larger than the sum of its proper divisors (103741).

145597091 is a wasteful number, since it uses less digits than its factorization.

145597091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103740.

The product of its (nonzero) digits is 56700, while the sum is 41.

The square root of 145597091 is about 12066.3619620829. The cubic root of 145597091 is about 526.0789192308.

The spelling of 145597091 in words is "one hundred forty-five million, five hundred ninety-seven thousand, ninety-one".