145744891 has 2 divisors, whose sum is σ = 145744892. Its totient is φ = 145744890.

The previous prime is 145744889. The next prime is 145744909. The reversal of 145744891 is 198447541.

It is a weak prime.

It is an emirp because it is prime and its reverse (198447541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145744891 - 2¹ = 145744889 is a prime.

Together with 145744889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (145744831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72872445 + 72872446.

It is an arithmetic number, because the mean of its divisors is an integer number (72872446).

Almost surely, 2^145744891 is an apocalyptic number.

145744891 is a deficient number, since it is larger than the sum of its proper divisors (1).

145744891 is an equidigital number, since it uses as much as digits as its factorization.

145744891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 43.

The square root of 145744891 is about 12072.4848726350. The cubic root of 145744891 is about 526.2568718906.

The spelling of 145744891 in words is "one hundred forty-five million, seven hundred forty-four thousand, eight hundred ninety-one".