113687391989 has 2 divisors, whose sum is σ = 113687391990. Its totient is φ = 113687391988.

The previous prime is 113687391967. The next prime is 113687392057. The reversal of 113687391989 is 989193786311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100469980900 + 13217411089 = 316970^2 + 114967^2 .

It is a cyclic number.

It is not a de Polignac number, because 113687391989 - 2¹² = 113687387893 is a prime.

It is a super-2 number, since 2×113687391989² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113687381989) 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, 56843695994 + 56843695995.

It is an arithmetic number, because the mean of its divisors is an integer number (56843695995).

Almost surely, 2^113687391989 is an apocalyptic number.

It is an amenable number.

113687391989 is a deficient number, since it is larger than the sum of its proper divisors (1).

113687391989 is an equidigital number, since it uses as much as digits as its factorization.

113687391989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17635968, while the sum is 65.

The spelling of 113687391989 in words is "one hundred thirteen billion, six hundred eighty-seven million, three hundred ninety-one thousand, nine hundred eighty-nine".