1231140347 has 2 divisors, whose sum is σ = 1231140348. Its totient is φ = 1231140346.

The previous prime is 1231140329. The next prime is 1231140367. The reversal of 1231140347 is 7430411321.

It is a weak prime.

It is an emirp because it is prime and its reverse (7430411321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231140347 - 2¹⁰ = 1231139323 is a prime.

It is a super-2 number, since 2×1231140347² = 3031413108022560818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1231140367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615570173 + 615570174.

It is an arithmetic number, because the mean of its divisors is an integer number (615570174).

Almost surely, 2^1231140347 is an apocalyptic number.

1231140347 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231140347 is an equidigital number, since it uses as much as digits as its factorization.

1231140347 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 1231140347 is about 35087.6095937013. The cubic root of 1231140347 is about 1071.7722825487.

Adding to 1231140347 its reverse (7430411321), we get a palindrome (8661551668).

The spelling of 1231140347 in words is "one billion, two hundred thirty-one million, one hundred forty thousand, three hundred forty-seven".