145309393 has 2 divisors, whose sum is σ = 145309394. Its totient is φ = 145309392.

The previous prime is 145309379. The next prime is 145309457. The reversal of 145309393 is 393903541.

145309393 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., 108743184 + 36566209 = 10428^2 + 6047^2 .

It is a cyclic number.

It is not a de Polignac number, because 145309393 - 2¹³ = 145301201 is a prime.

It is a super-2 number, since 2×145309393² = 42229639388056898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (145309363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72654696 + 72654697.

It is an arithmetic number, because the mean of its divisors is an integer number (72654697).

Almost surely, 2^145309393 is an apocalyptic number.

It is an amenable number.

145309393 is a deficient number, since it is larger than the sum of its proper divisors (1).

145309393 is an equidigital number, since it uses as much as digits as its factorization.

145309393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43740, while the sum is 37.

The square root of 145309393 is about 12054.4345781957. The cubic root of 145309393 is about 525.7321823301.

The spelling of 145309393 in words is "one hundred forty-five million, three hundred nine thousand, three hundred ninety-three".