994991434981 has 2 divisors, whose sum is σ = 994991434982. Its totient is φ = 994991434980.

The previous prime is 994991434973. The next prime is 994991435017. The reversal of 994991434981 is 189434199499.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 937275696900 + 57715738081 = 968130^2 + 240241^2 .

It is a cyclic number.

It is not a de Polignac number, because 994991434981 - 2³ = 994991434973 is a prime.

It is a super-2 number, since 2×994991434981² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 994991434981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (994991434081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497495717490 + 497495717491.

It is an arithmetic number, because the mean of its divisors is an integer number (497495717491).

Almost surely, 2^994991434981 is an apocalyptic number.

It is an amenable number.

994991434981 is a deficient number, since it is larger than the sum of its proper divisors (1).

994991434981 is an equidigital number, since it uses as much as digits as its factorization.

994991434981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90699264, while the sum is 70.

The spelling of 994991434981 in words is "nine hundred ninety-four billion, nine hundred ninety-one million, four hundred thirty-four thousand, nine hundred eighty-one".