145538493 has 4 divisors (see below), whose sum is σ = 194051328. Its totient is φ = 97025660.

The previous prime is 145538483. The next prime is 145538507. The reversal of 145538493 is 394835541.

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.

It is a cyclic number.

It is not a de Polignac number, because 145538493 - 2⁶ = 145538429 is a prime.

It is a super-2 number, since 2×145538493² = 42362905889422098, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145538473) 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 in 3 ways as a sum of consecutive naturals, for example, 24256413 + ... + 24256418.

It is an arithmetic number, because the mean of its divisors is an integer number (48512832).

Almost surely, 2^145538493 is an apocalyptic number.

It is an amenable number.

145538493 is a deficient number, since it is larger than the sum of its proper divisors (48512835).

145538493 is an equidigital number, since it uses as much as digits as its factorization.

145538493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48512834.

The product of its digits is 259200, while the sum is 42.

The square root of 145538493 is about 12063.9335624828. The cubic root of 145538493 is about 526.0083333218.

The spelling of 145538493 in words is "one hundred forty-five million, five hundred thirty-eight thousand, four hundred ninety-three".