145225639 has 4 divisors (see below), whose sum is σ = 156396856. Its totient is φ = 134054424.

The previous prime is 145225637. The next prime is 145225651. The reversal of 145225639 is 936522541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936522541 = 1913 ⋅489557.

It is a cyclic number.

It is not a de Polignac number, because 145225639 - 2¹ = 145225637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145225598 and 145225607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145225631) 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, 5585589 + ... + 5585614.

It is an arithmetic number, because the mean of its divisors is an integer number (39099214).

Almost surely, 2^145225639 is an apocalyptic number.

145225639 is a deficient number, since it is larger than the sum of its proper divisors (11171217).

145225639 is a wasteful number, since it uses less digits than its factorization.

145225639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11171216.

The product of its digits is 64800, while the sum is 37.

The square root of 145225639 is about 12050.9600862338. The cubic root of 145225639 is about 525.6311550558.

The spelling of 145225639 in words is "one hundred forty-five million, two hundred twenty-five thousand, six hundred thirty-nine".