145339993 has 2 divisors, whose sum is σ = 145339994. Its totient is φ = 145339992.

The previous prime is 145339991. The next prime is 145340009. The reversal of 145339993 is 399933541.

145339993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85618009 + 59721984 = 9253^2 + 7728^2 .

It is a cyclic number.

It is not a de Polignac number, because 145339993 - 2¹ = 145339991 is a prime.

It is a super-2 number, since 2×145339993² = 42247427130480098, which contains 22 as substring.

Together with 145339991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (145339991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72669996 + 72669997.

It is an arithmetic number, because the mean of its divisors is an integer number (72669997).

Almost surely, 2^145339993 is an apocalyptic number.

It is an amenable number.

145339993 is a deficient number, since it is larger than the sum of its proper divisors (1).

145339993 is an equidigital number, since it uses as much as digits as its factorization.

145339993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 393660, while the sum is 46.

The square root of 145339993 is about 12055.7037538254. The cubic root of 145339993 is about 525.7690835364.

The spelling of 145339993 in words is "one hundred forty-five million, three hundred thirty-nine thousand, nine hundred ninety-three".