307221093 has 60 divisors (see below), whose sum is σ = 501406092. Its totient is φ = 186796800.

The previous prime is 307221043. The next prime is 307221113. The reversal of 307221093 is 390122703.

It can be written as a sum of positive squares in 2 ways, for example, as 272151009 + 35070084 = 16497^2 + 5922^2 .

It is not a de Polignac number, because 307221093 - 2⁶ = 307221029 is a prime.

It is a super-2 number, since 2×307221093² = 188769599968229298, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (307221023) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 3041743 + ... + 3041843.

Almost surely, 2^307221093 is an apocalyptic number.

It is an amenable number.

307221093 is a deficient number, since it is larger than the sum of its proper divisors (194184999).

307221093 is a wasteful number, since it uses less digits than its factorization.

307221093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 307221093 is about 17527.7235544152. The cubic root of 307221093 is about 674.7615750522.

Adding to 307221093 its reverse (390122703), we get a palindrome (697343796).

The spelling of 307221093 in words is "three hundred seven million, two hundred twenty-one thousand, ninety-three".