9958681 has 2 divisors, whose sum is σ = 9958682. Its totient is φ = 9958680.

The previous prime is 9958639. The next prime is 9958691. The reversal of 9958681 is 1868599.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6843456 + 3115225 = 2616^2 + 1765^2 .

It is an emirp because it is prime and its reverse (1868599) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9958681 - 2¹³ = 9950489 is a prime.

It is a super-2 number, since 2×9958681² = 198350654519522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9958621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4979340 + 4979341.

It is an arithmetic number, because the mean of its divisors is an integer number (4979341).

Almost surely, 2^9958681 is an apocalyptic number.

It is an amenable number.

9958681 is a deficient number, since it is larger than the sum of its proper divisors (1).

9958681 is an equidigital number, since it uses as much as digits as its factorization.

9958681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 46.

The square root of 9958681 is about 3155.7377901214. The cubic root of 9958681 is about 215.1463290860.

Subtracting from 9958681 its product of digits (155520), we obtain a square (9803161 = 3131²).

The spelling of 9958681 in words is "nine million, nine hundred fifty-eight thousand, six hundred eighty-one".