145905257 has 4 divisors (see below), whose sum is σ = 145941120. Its totient is φ = 145869396.

The previous prime is 145905247. The next prime is 145905301. The reversal of 145905257 is 752509541.

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.

It is a cyclic number.

It is not a de Polignac number, because 145905257 - 2²⁰ = 144856681 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 145905257.

It is not an unprimeable number, because it can be changed into a prime (145905217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10913 + ... + 20270.

It is an arithmetic number, because the mean of its divisors is an integer number (36485280).

Almost surely, 2^145905257 is an apocalyptic number.

It is an amenable number.

145905257 is a deficient number, since it is larger than the sum of its proper divisors (35863).

145905257 is an equidigital number, since it uses as much as digits as its factorization.

145905257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35862.

The product of its (nonzero) digits is 63000, while the sum is 38.

The square root of 145905257 is about 12079.1248441267. The cubic root of 145905257 is about 526.4498181052.

The spelling of 145905257 in words is "one hundred forty-five million, nine hundred five thousand, two hundred fifty-seven".