1291252343 has 2 divisors, whose sum is σ = 1291252344. Its totient is φ = 1291252342.

The previous prime is 1291252337. The next prime is 1291252373. The reversal of 1291252343 is 3432521921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1291252343 - 2⁶ = 1291252279 is a prime.

It is a super-2 number, since 2×1291252343² = 3334665226605979298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291252373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645626171 + 645626172.

It is an arithmetic number, because the mean of its divisors is an integer number (645626172).

Almost surely, 2^1291252343 is an apocalyptic number.

1291252343 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291252343 is an equidigital number, since it uses as much as digits as its factorization.

1291252343 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 32.

The square root of 1291252343 is about 35933.9998191128. Note that the first 3 decimals coincide. The cubic root of 1291252343 is about 1088.9393894417.

The spelling of 1291252343 in words is "one billion, two hundred ninety-one million, two hundred fifty-two thousand, three hundred forty-three".