9213989731 has 2 divisors, whose sum is σ = 9213989732. Its totient is φ = 9213989730.

The previous prime is 9213989689. The next prime is 9213989747. The reversal of 9213989731 is 1379893129.

It is a strong prime.

It is an emirp because it is prime and its reverse (1379893129) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9213989731 - 2¹⁵ = 9213956963 is a prime.

It is a super-2 number, since 2×9213989731² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9213989791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4606994865 + 4606994866.

It is an arithmetic number, because the mean of its divisors is an integer number (4606994866).

Almost surely, 2^9213989731 is an apocalyptic number.

9213989731 is a deficient number, since it is larger than the sum of its proper divisors (1).

9213989731 is an equidigital number, since it uses as much as digits as its factorization.

9213989731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 52.

The square root of 9213989731 is about 95989.5292779374. The cubic root of 9213989731 is about 2096.4406622916.

The spelling of 9213989731 in words is "nine billion, two hundred thirteen million, nine hundred eighty-nine thousand, seven hundred thirty-one".