11231309987 has 2 divisors, whose sum is σ = 11231309988. Its totient is φ = 11231309986.

The previous prime is 11231309983. The next prime is 11231310011. The reversal of 11231309987 is 78990313211.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11231309987 - 2² = 11231309983 is a prime.

It is a super-2 number, since 2×11231309987² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11231309983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5615654993 + 5615654994.

It is an arithmetic number, because the mean of its divisors is an integer number (5615654994).

Almost surely, 2^11231309987 is an apocalyptic number.

11231309987 is a deficient number, since it is larger than the sum of its proper divisors (1).

11231309987 is an equidigital number, since it uses as much as digits as its factorization.

11231309987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 44.

The spelling of 11231309987 in words is "eleven billion, two hundred thirty-one million, three hundred nine thousand, nine hundred eighty-seven".