145115293 has 4 divisors (see below), whose sum is σ = 152752960. Its totient is φ = 137477628.

The previous prime is 145115287. The next prime is 145115317. The reversal of 145115293 is 392511541.

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: 392511541 = 251 ⋅1563791.

It is a cyclic number.

It is not a de Polignac number, because 145115293 - 2¹⁷ = 144984221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145115263) 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, 3818805 + ... + 3818842.

It is an arithmetic number, because the mean of its divisors is an integer number (38188240).

Almost surely, 2^145115293 is an apocalyptic number.

It is an amenable number.

145115293 is a deficient number, since it is larger than the sum of its proper divisors (7637667).

145115293 is an equidigital number, since it uses as much as digits as its factorization.

145115293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7637666.

The product of its digits is 5400, while the sum is 31.

The square root of 145115293 is about 12046.3809088041. The cubic root of 145115293 is about 525.4979921783.

The spelling of 145115293 in words is "one hundred forty-five million, one hundred fifteen thousand, two hundred ninety-three".