9891424087 has 2 divisors, whose sum is σ = 9891424088. Its totient is φ = 9891424086.

The previous prime is 9891424063. The next prime is 9891424129. The reversal of 9891424087 is 7804241989.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (7804241989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9891424087 - 2¹⁵ = 9891391319 is a prime.

It is a super-3 number, since 3×9891424087³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9891424787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4945712043 + 4945712044.

It is an arithmetic number, because the mean of its divisors is an integer number (4945712044).

Almost surely, 2^9891424087 is an apocalyptic number.

9891424087 is a deficient number, since it is larger than the sum of its proper divisors (1).

9891424087 is an equidigital number, since it uses as much as digits as its factorization.

9891424087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 52.

The square root of 9891424087 is about 99455.6387893618. The cubic root of 9891424087 is about 2146.6089747327.

The spelling of 9891424087 in words is "nine billion, eight hundred ninety-one million, four hundred twenty-four thousand, eighty-seven".