9487434221 has 2 divisors, whose sum is σ = 9487434222. Its totient is φ = 9487434220.

The previous prime is 9487434193. The next prime is 9487434263. The reversal of 9487434221 is 1224347849.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8233566121 + 1253868100 = 90739^2 + 35410^2 .

It is a cyclic number.

It is not a de Polignac number, because 9487434221 - 2⁶ = 9487434157 is a prime.

It is a super-2 number, since 2×9487434221² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9487434421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4743717110 + 4743717111.

It is an arithmetic number, because the mean of its divisors is an integer number (4743717111).

Almost surely, 2^9487434221 is an apocalyptic number.

It is an amenable number.

9487434221 is a deficient number, since it is larger than the sum of its proper divisors (1).

9487434221 is an equidigital number, since it uses as much as digits as its factorization.

9487434221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 44.

The square root of 9487434221 is about 97403.4610319366. The cubic root of 9487434221 is about 2116.9775832139.

The spelling of 9487434221 in words is "nine billion, four hundred eighty-seven million, four hundred thirty-four thousand, two hundred twenty-one".