145389889 has 2 divisors, whose sum is σ = 145389890. Its totient is φ = 145389888.

The previous prime is 145389869. The next prime is 145389911. The reversal of 145389889 is 988983541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116316225 + 29073664 = 10785^2 + 5392^2 .

It is a cyclic number.

It is not a de Polignac number, because 145389889 - 2⁵ = 145389857 is a prime.

It is a super-2 number, since 2×145389889² = 42276439646864642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (145389869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72694944 + 72694945.

It is an arithmetic number, because the mean of its divisors is an integer number (72694945).

Almost surely, 2^145389889 is an apocalyptic number.

It is an amenable number.

145389889 is a deficient number, since it is larger than the sum of its proper divisors (1).

145389889 is an equidigital number, since it uses as much as digits as its factorization.

145389889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2488320, while the sum is 55.

The square root of 145389889 is about 12057.7729701633. The cubic root of 145389889 is about 525.8292431024.

The spelling of 145389889 in words is "one hundred forty-five million, three hundred eighty-nine thousand, eight hundred eighty-nine".