1230340987991 has 2 divisors, whose sum is σ = 1230340987992. Its totient is φ = 1230340987990.

The previous prime is 1230340987949. The next prime is 1230340987999. The reversal of 1230340987991 is 1997890430321.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1230340987991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1230340987999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615170493995 + 615170493996.

It is an arithmetic number, because the mean of its divisors is an integer number (615170493996).

Almost surely, 2^{1230340987991} is an apocalyptic number.

1230340987991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1230340987991 is an equidigital number, since it uses as much as digits as its factorization.

1230340987991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2939328, while the sum is 56.

The spelling of 1230340987991 in words is "one trillion, two hundred thirty billion, three hundred forty million, nine hundred eighty-seven thousand, nine hundred ninety-one".