145749889 has 2 divisors, whose sum is σ = 145749890. Its totient is φ = 145749888.

The previous prime is 145749887. The next prime is 145749917. The reversal of 145749889 is 988947541.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86583025 + 59166864 = 9305^2 + 7692^2 .

It is an emirp because it is prime and its reverse (988947541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145749889 - 2¹ = 145749887 is a prime.

Together with 145749887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (145749887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72874944 + 72874945.

It is an arithmetic number, because the mean of its divisors is an integer number (72874945).

Almost surely, 2^145749889 is an apocalyptic number.

It is an amenable number.

145749889 is a deficient number, since it is larger than the sum of its proper divisors (1).

145749889 is an equidigital number, since it uses as much as digits as its factorization.

145749889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 55.

The square root of 145749889 is about 12072.6918704985. The cubic root of 145749889 is about 526.2628874286.

The spelling of 145749889 in words is "one hundred forty-five million, seven hundred forty-nine thousand, eight hundred eighty-nine".