145681889 has 2 divisors, whose sum is σ = 145681890. Its totient is φ = 145681888.

The previous prime is 145681883. The next prime is 145681933. The reversal of 145681889 is 988186541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139051264 + 6630625 = 11792^2 + 2575^2 .

It is a cyclic number.

It is not a de Polignac number, because 145681889 - 2⁸ = 145681633 is a prime.

It is not a weakly prime, because it can be changed into another prime (145681883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72840944 + 72840945.

It is an arithmetic number, because the mean of its divisors is an integer number (72840945).

Almost surely, 2^145681889 is an apocalyptic number.

It is an amenable number.

145681889 is a deficient number, since it is larger than the sum of its proper divisors (1).

145681889 is an equidigital number, since it uses as much as digits as its factorization.

145681889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 552960, while the sum is 50.

The square root of 145681889 is about 12069.8752686181. The cubic root of 145681889 is about 526.1810315787.

The spelling of 145681889 in words is "one hundred forty-five million, six hundred eighty-one thousand, eight hundred eighty-nine".