145256819 has 4 divisors (see below), whose sum is σ = 145283040. Its totient is φ = 145230600.

The previous prime is 145256777. The next prime is 145256827. The reversal of 145256819 is 918652541.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145256819 is a prime.

It is a super-2 number, since 2×145256819² = 42199086931997522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145256869) 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, 1184 + ... + 17085.

It is an arithmetic number, because the mean of its divisors is an integer number (36320760).

Almost surely, 2^145256819 is an apocalyptic number.

145256819 is a deficient number, since it is larger than the sum of its proper divisors (26221).

145256819 is an equidigital number, since it uses as much as digits as its factorization.

145256819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26220.

The product of its digits is 86400, while the sum is 41.

The square root of 145256819 is about 12052.2536896632. The cubic root of 145256819 is about 525.6687701003.

The spelling of 145256819 in words is "one hundred forty-five million, two hundred fifty-six thousand, eight hundred nineteen".