145117893 has 4 divisors (see below), whose sum is σ = 193490528. Its totient is φ = 96745260.

The previous prime is 145117873. The next prime is 145117939. The reversal of 145117893 is 398711541.

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 not a de Polignac number, because 145117893 - 2⁹ = 145117381 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145117813) 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, 24186313 + ... + 24186318.

It is an arithmetic number, because the mean of its divisors is an integer number (48372632).

Almost surely, 2^145117893 is an apocalyptic number.

It is an amenable number.

145117893 is a deficient number, since it is larger than the sum of its proper divisors (48372635).

145117893 is an equidigital number, since it uses as much as digits as its factorization.

145117893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48372634.

The product of its digits is 30240, while the sum is 39.

The square root of 145117893 is about 12046.4888245497. The cubic root of 145117893 is about 525.5011305717.

The spelling of 145117893 in words is "one hundred forty-five million, one hundred seventeen thousand, eight hundred ninety-three".