145969 has 2 divisors, whose sum is σ = 145970. Its totient is φ = 145968.

The previous prime is 145967. The next prime is 145987. The reversal of 145969 is 969541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113569 + 32400 = 337^2 + 180^2 .

It is a cyclic number.

It is not a de Polignac number, because 145969 - 2¹ = 145967 is a prime.

It is a super-2 number, since 2×145969² = 42613897922, which contains 22 as substring.

Together with 145967, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (145963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72984 + 72985.

It is an arithmetic number, because the mean of its divisors is an integer number (72985).

2¹⁴⁵⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

145969 is a deficient number, since it is larger than the sum of its proper divisors (1).

145969 is an equidigital number, since it uses as much as digits as its factorization.

145969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 34.

The square root of 145969 is about 382.0588959833. The cubic root of 145969 is about 52.6526471969.

The spelling of 145969 in words is "one hundred forty-five thousand, nine hundred sixty-nine".