145491393 has 4 divisors (see below), whose sum is σ = 193988528. Its totient is φ = 96994260.

The previous prime is 145491391. The next prime is 145491427. The reversal of 145491393 is 393194541.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 393194541 = 3 ⋅131064847.

It is not a de Polignac number, because 145491393 - 2¹ = 145491391 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (145491391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24248563 + ... + 24248568.

It is an arithmetic number, because the mean of its divisors is an integer number (48497132).

Almost surely, 2^145491393 is an apocalyptic number.

It is an amenable number.

145491393 is a deficient number, since it is larger than the sum of its proper divisors (48497135).

145491393 is an equidigital number, since it uses as much as digits as its factorization.

145491393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48497134.

The product of its digits is 58320, while the sum is 39.

The square root of 145491393 is about 12061.9813049101. The cubic root of 145491393 is about 525.9515839238.

The spelling of 145491393 in words is "one hundred forty-five million, four hundred ninety-one thousand, three hundred ninety-three".