1187689842431 has 2 divisors, whose sum is σ = 1187689842432. Its totient is φ = 1187689842430.

The previous prime is 1187689842389. The next prime is 1187689842439. The reversal of 1187689842431 is 1342489867811.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1187689842431 is a prime.

It is a super-2 number, since 2×1187689842431² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1187689842439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 593844921215 + 593844921216.

It is an arithmetic number, because the mean of its divisors is an integer number (593844921216).

Almost surely, 2^{1187689842431} is an apocalyptic number.

1187689842431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1187689842431 is an equidigital number, since it uses as much as digits as its factorization.

1187689842431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18579456, while the sum is 62.

The spelling of 1187689842431 in words is "one trillion, one hundred eighty-seven billion, six hundred eighty-nine million, eight hundred forty-two thousand, four hundred thirty-one".