145274221 has 4 divisors (see below), whose sum is σ = 146632032. Its totient is φ = 143916412.

The previous prime is 145274203. The next prime is 145274251. The reversal of 145274221 is 122472541.

145274221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 145274221 - 2⁷ = 145274093 is a prime.

It is a super-2 number, since 2×145274221² = 42209198574313682, which contains 22 as substring.

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 145274221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145274201) 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, 678745 + ... + 678958.

It is an arithmetic number, because the mean of its divisors is an integer number (36658008).

Almost surely, 2^145274221 is an apocalyptic number.

It is an amenable number.

145274221 is a deficient number, since it is larger than the sum of its proper divisors (1357811).

145274221 is a wasteful number, since it uses less digits than its factorization.

145274221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357810.

The product of its digits is 4480, while the sum is 28.

The square root of 145274221 is about 12052.9756077078. The cubic root of 145274221 is about 525.6897612495.

The spelling of 145274221 in words is "one hundred forty-five million, two hundred seventy-four thousand, two hundred twenty-one".