145821569 has 2 divisors, whose sum is σ = 145821570. Its totient is φ = 145821568.

The previous prime is 145821553. The next prime is 145821581. The reversal of 145821569 is 965128541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112042225 + 33779344 = 10585^2 + 5812^2 .

It is a cyclic number.

It is not a de Polignac number, because 145821569 - 2⁴ = 145821553 is a prime.

It is a super-2 number, since 2×145821569² = 42527859971243522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (145821539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72910784 + 72910785.

It is an arithmetic number, because the mean of its divisors is an integer number (72910785).

Almost surely, 2^145821569 is an apocalyptic number.

It is an amenable number.

145821569 is a deficient number, since it is larger than the sum of its proper divisors (1).

145821569 is an equidigital number, since it uses as much as digits as its factorization.

145821569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 41.

The square root of 145821569 is about 12075.6601889917. The cubic root of 145821569 is about 526.3491455651.

The spelling of 145821569 in words is "one hundred forty-five million, eight hundred twenty-one thousand, five hundred sixty-nine".