1231512343 has 2 divisors, whose sum is σ = 1231512344. Its totient is φ = 1231512342.

The previous prime is 1231512323. The next prime is 1231512427. The reversal of 1231512343 is 3432151321.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231512343 - 2²¹ = 1229415191 is a prime.

It is a super-2 number, since 2×1231512343² = 3033245301922699298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231512323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615756171 + 615756172.

It is an arithmetic number, because the mean of its divisors is an integer number (615756172).

Almost surely, 2^1231512343 is an apocalyptic number.

1231512343 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231512343 is an equidigital number, since it uses as much as digits as its factorization.

1231512343 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 25.

The square root of 1231512343 is about 35092.9101529070. The cubic root of 1231512343 is about 1071.8802190250.

Adding to 1231512343 its reverse (3432151321), we get a palindrome (4663663664).

The spelling of 1231512343 in words is "one billion, two hundred thirty-one million, five hundred twelve thousand, three hundred forty-three".