145439969 has 2 divisors, whose sum is σ = 145439970. Its totient is φ = 145439968.

The previous prime is 145439963. The next prime is 145440013. The reversal of 145439969 is 969934541.

145439969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119071744 + 26368225 = 10912^2 + 5135^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145439969 is a prime.

It is a super-2 number, since 2×145439969² = 42305569165441922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (145439963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72719984 + 72719985.

It is an arithmetic number, because the mean of its divisors is an integer number (72719985).

Almost surely, 2^145439969 is an apocalyptic number.

It is an amenable number.

145439969 is a deficient number, since it is larger than the sum of its proper divisors (1).

145439969 is an equidigital number, since it uses as much as digits as its factorization.

145439969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 50.

The square root of 145439969 is about 12059.8494600886. The cubic root of 145439969 is about 525.8896106784.

The spelling of 145439969 in words is "one hundred forty-five million, four hundred thirty-nine thousand, nine hundred sixty-nine".