145756889 has 2 divisors, whose sum is σ = 145756890. Its totient is φ = 145756888.

The previous prime is 145756859. The next prime is 145756907. The reversal of 145756889 is 988657541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145612489 + 144400 = 12067^2 + 380^2 .

It is an emirp because it is prime and its reverse (988657541) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145756889 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 145756889.

It is not a weakly prime, because it can be changed into another prime (145756829) 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, 72878444 + 72878445.

It is an arithmetic number, because the mean of its divisors is an integer number (72878445).

Almost surely, 2^145756889 is an apocalyptic number.

It is an amenable number.

145756889 is a deficient number, since it is larger than the sum of its proper divisors (1).

145756889 is an equidigital number, since it uses as much as digits as its factorization.

145756889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2419200, while the sum is 53.

The square root of 145756889 is about 12072.9817775063. The cubic root of 145756889 is about 526.2713123206.

The spelling of 145756889 in words is "one hundred forty-five million, seven hundred fifty-six thousand, eight hundred eighty-nine".