745186221 has 24 divisors (see below), whose sum is σ = 1163536920. Its totient is φ = 456852096.

The previous prime is 745186207. The next prime is 745186229. The reversal of 745186221 is 122681547.

It can be written as a sum of positive squares in 4 ways, for example, as 10017225 + 735168996 = 3165^2 + 27114^2 .

It is not a de Polignac number, because 745186221 - 2¹⁰ = 745185197 is a prime.

It is a super-3 number, since 3×745186221³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745186229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19635 + ... + 43311.

It is an arithmetic number, because the mean of its divisors is an integer number (48480705).

Almost surely, 2^745186221 is an apocalyptic number.

It is an amenable number.

745186221 is a deficient number, since it is larger than the sum of its proper divisors (418350699).

745186221 is a wasteful number, since it uses less digits than its factorization.

745186221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23965 (or 23962 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 745186221 is about 27298.0992195427. The cubic root of 745186221 is about 906.6122968016.

It can be divided in two parts, 745 and 186221, that added together give a triangular number (186966 = T₆₁₁).

The spelling of 745186221 in words is "seven hundred forty-five million, one hundred eighty-six thousand, two hundred twenty-one".