145663993 has 2 divisors, whose sum is σ = 145663994. Its totient is φ = 145663992.

The previous prime is 145663961. The next prime is 145664011. The reversal of 145663993 is 399366541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85322169 + 60341824 = 9237^2 + 7768^2 .

It is a cyclic number.

It is not a de Polignac number, because 145663993 - 2⁵ = 145663961 is a prime.

It is not a weakly prime, because it can be changed into another prime (145663943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72831996 + 72831997.

It is an arithmetic number, because the mean of its divisors is an integer number (72831997).

Almost surely, 2^145663993 is an apocalyptic number.

It is an amenable number.

145663993 is a deficient number, since it is larger than the sum of its proper divisors (1).

145663993 is an equidigital number, since it uses as much as digits as its factorization.

145663993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 524880, while the sum is 46.

The square root of 145663993 is about 12069.1338960176. The cubic root of 145663993 is about 526.1594848112.

The spelling of 145663993 in words is "one hundred forty-five million, six hundred sixty-three thousand, nine hundred ninety-three".