105640987 has 2 divisors, whose sum is σ = 105640988. Its totient is φ = 105640986.

The previous prime is 105640979. The next prime is 105640991. The reversal of 105640987 is 789046501.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 105640987 - 2³ = 105640979 is a prime.

It is a super-2 number, since 2×105640987² = 22320036268668338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (105640187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52820493 + 52820494.

It is an arithmetic number, because the mean of its divisors is an integer number (52820494).

Almost surely, 2^105640987 is an apocalyptic number.

105640987 is a deficient number, since it is larger than the sum of its proper divisors (1).

105640987 is an equidigital number, since it uses as much as digits as its factorization.

105640987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 105640987 is about 10278.1801404723. The cubic root of 105640987 is about 472.7274449715.

The spelling of 105640987 in words is "one hundred five million, six hundred forty thousand, nine hundred eighty-seven".