9997991413 has 2 divisors, whose sum is σ = 9997991414. Its totient is φ = 9997991412.

The previous prime is 9997991411. The next prime is 9997991429. The reversal of 9997991413 is 3141997999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5285580804 + 4712410609 = 72702^2 + 68647^2 .

It is a cyclic number.

It is not a de Polignac number, because 9997991413 - 2¹ = 9997991411 is a prime.

Together with 9997991411, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9997991411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4998995706 + 4998995707.

It is an arithmetic number, because the mean of its divisors is an integer number (4998995707).

Almost surely, 2^9997991413 is an apocalyptic number.

It is an amenable number.

9997991413 is a deficient number, since it is larger than the sum of its proper divisors (1).

9997991413 is an equidigital number, since it uses as much as digits as its factorization.

9997991413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4960116, while the sum is 61.

The square root of 9997991413 is about 99989.9565606466. The cubic root of 9997991413 is about 2154.2904347228.

The spelling of 9997991413 in words is "nine billion, nine hundred ninety-seven million, nine hundred ninety-one thousand, four hundred thirteen".