145188491 has 16 divisors (see below), whose sum is σ = 169728000. Its totient is φ = 121631328.

The previous prime is 145188487. The next prime is 145188509. The reversal of 145188491 is 194881541.

145188491 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 145188491 - 2² = 145188487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145188401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55685 + ... + 58233.

It is an arithmetic number, because the mean of its divisors is an integer number (10608000).

Almost surely, 2^145188491 is an apocalyptic number.

145188491 is a deficient number, since it is larger than the sum of its proper divisors (24539509).

145188491 is a wasteful number, since it uses less digits than its factorization.

145188491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2738.

The product of its digits is 46080, while the sum is 41.

The square root of 145188491 is about 12049.4186996718. The cubic root of 145188491 is about 525.5863332842.

The spelling of 145188491 in words is "one hundred forty-five million, one hundred eighty-eight thousand, four hundred ninety-one".