145555405 has 4 divisors (see below), whose sum is σ = 174666492. Its totient is φ = 116444320.

The previous prime is 145555391. The next prime is 145555429. The reversal of 145555405 is 504555541.

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

It can be written as a sum of positive squares in 2 ways, for example, as 28526281 + 117029124 = 5341^2 + 10818^2 .

It is a de Polignac number, because none of the positive numbers 2^k-145555405 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14555536 + ... + 14555545.

It is an arithmetic number, because the mean of its divisors is an integer number (43666623).

Almost surely, 2^145555405 is an apocalyptic number.

It is an amenable number.

145555405 is a deficient number, since it is larger than the sum of its proper divisors (29111087).

145555405 is an equidigital number, since it uses as much as digits as its factorization.

145555405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29111086.

The product of its (nonzero) digits is 50000, while the sum is 34.

The square root of 145555405 is about 12064.6344743635. The cubic root of 145555405 is about 526.0287071033.

The spelling of 145555405 in words is "one hundred forty-five million, five hundred fifty-five thousand, four hundred five".