8451111121 has 4 divisors (see below), whose sum is σ = 8452391092. Its totient is φ = 8449831152.

The previous prime is 8451111113. The next prime is 8451111127. The reversal of 8451111121 is 1211111548.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3592324096 + 4858787025 = 59936^2 + 69705^2 .

It is a cyclic number.

It is not a de Polignac number, because 8451111121 - 2³ = 8451111113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8451111127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 630030 + ... + 643303.

It is an arithmetic number, because the mean of its divisors is an integer number (2113097773).

Almost surely, 2^8451111121 is an apocalyptic number.

It is an amenable number.

8451111121 is a deficient number, since it is larger than the sum of its proper divisors (1279971).

8451111121 is a wasteful number, since it uses less digits than its factorization.

8451111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279970.

The product of its digits is 320, while the sum is 25.

The square root of 8451111121 is about 91929.9250570781. The cubic root of 8451111121 is about 2036.9073285215.

Adding to 8451111121 its reverse (1211111548), we get a palindrome (9662222669).

The spelling of 8451111121 in words is "eight billion, four hundred fifty-one million, one hundred eleven thousand, one hundred twenty-one".