1243434631 has 2 divisors, whose sum is σ = 1243434632. Its totient is φ = 1243434630.

The previous prime is 1243434589. The next prime is 1243434637. The reversal of 1243434631 is 1364343421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1243434631 - 2²³ = 1235046023 is a prime.

It is a super-2 number, since 2×1243434631² = 3092259363140212322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1243434593 and 1243434602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243434637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621717315 + 621717316.

It is an arithmetic number, because the mean of its divisors is an integer number (621717316).

Almost surely, 2^1243434631 is an apocalyptic number.

1243434631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243434631 is an equidigital number, since it uses as much as digits as its factorization.

1243434631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 31.

The square root of 1243434631 is about 35262.3684825623. The cubic root of 1243434631 is about 1075.3280789873.

The spelling of 1243434631 in words is "one billion, two hundred forty-three million, four hundred thirty-four thousand, six hundred thirty-one".