145621223 has 4 divisors (see below), whose sum is σ = 158859528. Its totient is φ = 132382920.

The previous prime is 145621183. The next prime is 145621237. The reversal of 145621223 is 322126541.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 145621223 - 2⁸ = 145620967 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145621192 and 145621201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145621283) 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, 6619136 + ... + 6619157.

It is an arithmetic number, because the mean of its divisors is an integer number (39714882).

Almost surely, 2^145621223 is an apocalyptic number.

145621223 is a deficient number, since it is larger than the sum of its proper divisors (13238305).

145621223 is a wasteful number, since it uses less digits than its factorization.

145621223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13238304.

The product of its digits is 2880, while the sum is 26.

The square root of 145621223 is about 12067.3618906536. The cubic root of 145621223 is about 526.1079826209.

Adding to 145621223 its reverse (322126541), we get a palindrome (467747764).

The spelling of 145621223 in words is "one hundred forty-five million, six hundred twenty-one thousand, two hundred twenty-three".