1215620843 has 2 divisors, whose sum is σ = 1215620844. Its totient is φ = 1215620842.

The previous prime is 1215620827. The next prime is 1215620851. The reversal of 1215620843 is 3480265121.

It is a strong prime.

It is an emirp because it is prime and its reverse (3480265121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1215620843 - 2⁴ = 1215620827 is a prime.

It is not a weakly prime, because it can be changed into another prime (1215620803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607810421 + 607810422.

It is an arithmetic number, because the mean of its divisors is an integer number (607810422).

Almost surely, 2^1215620843 is an apocalyptic number.

1215620843 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215620843 is an equidigital number, since it uses as much as digits as its factorization.

1215620843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 1215620843 is about 34865.7545881342. The cubic root of 1215620843 is about 1067.2497112061.

Adding to 1215620843 its reverse (3480265121), we get a palindrome (4695885964).

The spelling of 1215620843 in words is "one billion, two hundred fifteen million, six hundred twenty thousand, eight hundred forty-three".