9638679121 has 2 divisors, whose sum is σ = 9638679122. Its totient is φ = 9638679120.

The previous prime is 9638679077. The next prime is 9638679131. The reversal of 9638679121 is 1219768369.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6611478721 + 3027200400 = 81311^2 + 55020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9638679121 is a prime.

It is not a weakly prime, because it can be changed into another prime (9638679131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4819339560 + 4819339561.

It is an arithmetic number, because the mean of its divisors is an integer number (4819339561).

Almost surely, 2^9638679121 is an apocalyptic number.

It is an amenable number.

9638679121 is a deficient number, since it is larger than the sum of its proper divisors (1).

9638679121 is an equidigital number, since it uses as much as digits as its factorization.

9638679121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 52.

The square root of 9638679121 is about 98176.7748553598. The cubic root of 9638679121 is about 2128.1676675775.

The spelling of 9638679121 in words is "nine billion, six hundred thirty-eight million, six hundred seventy-nine thousand, one hundred twenty-one".