145523617 has 2 divisors, whose sum is σ = 145523618. Its totient is φ = 145523616.

The previous prime is 145523591. The next prime is 145523639. The reversal of 145523617 is 716325541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119268241 + 26255376 = 10921^2 + 5124^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145523617 is a prime.

It is not a weakly prime, because it can be changed into another prime (145523647) 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, 72761808 + 72761809.

It is an arithmetic number, because the mean of its divisors is an integer number (72761809).

Almost surely, 2^145523617 is an apocalyptic number.

It is an amenable number.

145523617 is a deficient number, since it is larger than the sum of its proper divisors (1).

145523617 is an equidigital number, since it uses as much as digits as its factorization.

145523617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 34.

The square root of 145523617 is about 12063.3169982389. The cubic root of 145523617 is about 525.9904109920.

The spelling of 145523617 in words is "one hundred forty-five million, five hundred twenty-three thousand, six hundred seventeen".