9994156831 has 2 divisors, whose sum is σ = 9994156832. Its totient is φ = 9994156830.

The previous prime is 9994156817. The next prime is 9994156859. The reversal of 9994156831 is 1386514999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9994156831 - 2⁷ = 9994156703 is a prime.

It is a super-2 number, since 2×9994156831² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9994153831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4997078415 + 4997078416.

It is an arithmetic number, because the mean of its divisors is an integer number (4997078416).

Almost surely, 2^9994156831 is an apocalyptic number.

9994156831 is a deficient number, since it is larger than the sum of its proper divisors (1).

9994156831 is an equidigital number, since it uses as much as digits as its factorization.

9994156831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2099520, while the sum is 55.

The square root of 9994156831 is about 99970.7798859247. The cubic root of 9994156831 is about 2154.0149840744.

The spelling of 9994156831 in words is "nine billion, nine hundred ninety-four million, one hundred fifty-six thousand, eight hundred thirty-one".