145073891 has 4 divisors (see below), whose sum is σ = 145372272. Its totient is φ = 144775512.

The previous prime is 145073839. The next prime is 145073897. The reversal of 145073891 is 198370541.

145073891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145073891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145073897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148460 + ... + 149433.

It is an arithmetic number, because the mean of its divisors is an integer number (36343068).

Almost surely, 2^145073891 is an apocalyptic number.

145073891 is a deficient number, since it is larger than the sum of its proper divisors (298381).

145073891 is an equidigital number, since it uses as much as digits as its factorization.

145073891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298380.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 145073891 is about 12044.6623447899. The cubic root of 145073891 is about 525.4480118332.

The spelling of 145073891 in words is "one hundred forty-five million, seventy-three thousand, eight hundred ninety-one".