1243213547 has 2 divisors, whose sum is σ = 1243213548. Its totient is φ = 1243213546.

The previous prime is 1243213513. The next prime is 1243213571. The reversal of 1243213547 is 7453123421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1243213547 - 2²⁴ = 1226436331 is a prime.

It is not a weakly prime, because it can be changed into another prime (1243213507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621606773 + 621606774.

It is an arithmetic number, because the mean of its divisors is an integer number (621606774).

Almost surely, 2^1243213547 is an apocalyptic number.

1243213547 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243213547 is an equidigital number, since it uses as much as digits as its factorization.

1243213547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 32.

The square root of 1243213547 is about 35259.2334998933. The cubic root of 1243213547 is about 1075.2643437177.

Adding to 1243213547 its reverse (7453123421), we get a palindrome (8696336968).

The spelling of 1243213547 in words is "one billion, two hundred forty-three million, two hundred thirteen thousand, five hundred forty-seven".