145583993 has 2 divisors, whose sum is σ = 145583994. Its totient is φ = 145583992.

The previous prime is 145583987. The next prime is 145584001. The reversal of 145583993 is 399385541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81775849 + 63808144 = 9043^2 + 7988^2 .

It is an emirp because it is prime and its reverse (399385541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145583993 - 2¹⁸ = 145321849 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (145583983) 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, 72791996 + 72791997.

It is an arithmetic number, because the mean of its divisors is an integer number (72791997).

Almost surely, 2^145583993 is an apocalyptic number.

It is an amenable number.

145583993 is a deficient number, since it is larger than the sum of its proper divisors (1).

145583993 is an equidigital number, since it uses as much as digits as its factorization.

145583993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 583200, while the sum is 47.

The square root of 145583993 is about 12065.8192013638. The cubic root of 145583993 is about 526.0631433014.

The spelling of 145583993 in words is "one hundred forty-five million, five hundred eighty-three thousand, nine hundred ninety-three".