1213031999 has 2 divisors, whose sum is σ = 1213032000. Its totient is φ = 1213031998.

The previous prime is 1213031993. The next prime is 1213032017. The reversal of 1213031999 is 9991303121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213031999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213031993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606515999 + 606516000.

It is an arithmetic number, because the mean of its divisors is an integer number (606516000).

Almost surely, 2^1213031999 is an apocalyptic number.

1213031999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213031999 is an equidigital number, since it uses as much as digits as its factorization.

1213031999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13122, while the sum is 38.

The square root of 1213031999 is about 34828.6089156601. The cubic root of 1213031999 is about 1066.4915508208.

The spelling of 1213031999 in words is "one billion, two hundred thirteen million, thirty-one thousand, nine hundred ninety-nine".