994853432581 has 4 divisors (see below), whose sum is σ = 994855736032. Its totient is φ = 994851129132.

The previous prime is 994853432543. The next prime is 994853432609. The reversal of 994853432581 is 185234358499.

994853432581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 185234358499 = 691 ⋅268067089.

It is a 3-Lehmer number, since φ(994853432581) divides (994853432581-1)³.

It is a cyclic number.

It is not a de Polignac number, because 994853432581 - 2³¹ = 992705948933 is a prime.

It is a super-2 number, since 2×994853432581² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (994853439581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287931 + ... + 1439656.

It is an arithmetic number, because the mean of its divisors is an integer number (248713934008).

It is a Poulet number, since it divides 2^994853432580-1.

Almost surely, 2^994853432581 is an apocalyptic number.

994853432581 is the 575863-rd octagonal number.

It is an amenable number.

994853432581 is a deficient number, since it is larger than the sum of its proper divisors (2303451).

994853432581 is a wasteful number, since it uses less digits than its factorization.

994853432581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2303450.

The product of its digits is 37324800, while the sum is 61.

The spelling of 994853432581 in words is "nine hundred ninety-four billion, eight hundred fifty-three million, four hundred thirty-two thousand, five hundred eighty-one".