869801987 has 2 divisors, whose sum is σ = 869801988. Its totient is φ = 869801986.

The previous prime is 869801951. The next prime is 869802023. The reversal of 869801987 is 789108968.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (869801951) and next prime (869802023).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-869801987 is a prime.

It is not a weakly prime, because it can be changed into another prime (869801927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434900993 + 434900994.

It is an arithmetic number, because the mean of its divisors is an integer number (434900994).

Almost surely, 2^869801987 is an apocalyptic number.

869801987 is a deficient number, since it is larger than the sum of its proper divisors (1).

869801987 is an equidigital number, since it uses as much as digits as its factorization.

869801987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1741824, while the sum is 56.

The square root of 869801987 is about 29492.4055817765. The cubic root of 869801987 is about 954.5678396996.

The spelling of 869801987 in words is "eight hundred sixty-nine million, eight hundred one thousand, nine hundred eighty-seven".