9961387 has 2 divisors, whose sum is σ = 9961388. Its totient is φ = 9961386.

The previous prime is 9961381. The next prime is 9961397. The reversal of 9961387 is 7831699.

It is a weak prime.

It is an emirp because it is prime and its reverse (7831699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9961387 - 2¹⁵ = 9928619 is a prime.

It is not a weakly prime, because it can be changed into another prime (9961381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4980693 + 4980694.

It is an arithmetic number, because the mean of its divisors is an integer number (4980694).

Almost surely, 2^9961387 is an apocalyptic number.

9961387 is a deficient number, since it is larger than the sum of its proper divisors (1).

9961387 is an equidigital number, since it uses as much as digits as its factorization.

9961387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 43.

The square root of 9961387 is about 3156.1665038461. The cubic root of 9961387 is about 215.1658140373.

The spelling of 9961387 in words is "nine million, nine hundred sixty-one thousand, three hundred eighty-seven".