105731987 has 2 divisors, whose sum is σ = 105731988. Its totient is φ = 105731986.

The previous prime is 105731981. The next prime is 105732001. The reversal of 105731987 is 789137501.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105731987 is a prime.

It is a super-2 number, since 2×105731987² = 22358506149936338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (105731981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52865993 + 52865994.

It is an arithmetic number, because the mean of its divisors is an integer number (52865994).

Almost surely, 2^105731987 is an apocalyptic number.

105731987 is a deficient number, since it is larger than the sum of its proper divisors (1).

105731987 is an equidigital number, since it uses as much as digits as its factorization.

105731987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 41.

The square root of 105731987 is about 10282.6060412718. The cubic root of 105731987 is about 472.8631430957.

The spelling of 105731987 in words is "one hundred five million, seven hundred thirty-one thousand, nine hundred eighty-seven".