1213405320931 has 2 divisors, whose sum is σ = 1213405320932. Its totient is φ = 1213405320930.

The previous prime is 1213405320887. The next prime is 1213405320961. The reversal of 1213405320931 is 1390235043121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1213405320931 - 2²¹ = 1213403223779 is a prime.

It is a super-4 number, since 4×1213405320931⁴ (a number of 49 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (1213405320961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606702660465 + 606702660466.

It is an arithmetic number, because the mean of its divisors is an integer number (606702660466).

Almost surely, 2^{1213405320931} is an apocalyptic number.

1213405320931 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213405320931 is an equidigital number, since it uses as much as digits as its factorization.

1213405320931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 34.

The spelling of 1213405320931 in words is "one trillion, two hundred thirteen billion, four hundred five million, three hundred twenty thousand, nine hundred thirty-one".