2581343946 has 12 divisors (see below), whose sum is σ = 5592911922. Its totient is φ = 860447976.

The previous prime is 2581343939. The next prime is 2581343953. The reversal of 2581343946 is 6493431852.

2581343946 is a `hidden beast` number, since 2 + 581 + 34 + 39 + 4 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (2581343939) and next prime (2581343953).

It can be written as a sum of positive squares in only one way, i.e., 1959390225 + 621953721 = 44265^2 + 24939^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71703981 + ... + 71704016.

Almost surely, 2^2581343946 is an apocalyptic number.

2581343946 is an abundant number, since it is smaller than the sum of its proper divisors (3011567976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2581343946 is a wasteful number, since it uses less digits than its factorization.

2581343946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143408005 (or 143408002 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 2581343946 is about 50806.9281299313. The cubic root of 2581343946 is about 1371.7720770027.

The spelling of 2581343946 in words is "two billion, five hundred eighty-one million, three hundred forty-three thousand, nine hundred forty-six".