1231121273 has 2 divisors, whose sum is σ = 1231121274. Its totient is φ = 1231121272.

The previous prime is 1231121263. The next prime is 1231121329. The reversal of 1231121273 is 3721211321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1140547984 + 90573289 = 33772^2 + 9517^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231121273 - 2²² = 1226926969 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231121263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615560636 + 615560637.

It is an arithmetic number, because the mean of its divisors is an integer number (615560637).

Almost surely, 2^1231121273 is an apocalyptic number.

It is an amenable number.

1231121273 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231121273 is an equidigital number, since it uses as much as digits as its factorization.

1231121273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504, while the sum is 23.

The square root of 1231121273 is about 35087.3377872987. The cubic root of 1231121273 is about 1071.7667475475.

Adding to 1231121273 its reverse (3721211321), we get a palindrome (4952332594).

The spelling of 1231121273 in words is "one billion, two hundred thirty-one million, one hundred twenty-one thousand, two hundred seventy-three".