281581001004 has 12 divisors (see below), whose sum is σ = 657022335704. Its totient is φ = 93860333664.

The previous prime is 281581000997. The next prime is 281581001011. The reversal of 281581001004 is 400100185182.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (281581000997) and next prime (281581001011).

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11732541697 + ... + 11732541720.

Almost surely, 2^281581001004 is an apocalyptic number.

It is an amenable number.

281581001004 is an abundant number, since it is smaller than the sum of its proper divisors (375441334700).

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

281581001004 is a wasteful number, since it uses less digits than its factorization.

281581001004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23465083424 (or 23465083422 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 30.

Adding to 281581001004 its reverse (400100185182), we get a palindrome (681681186186).

The spelling of 281581001004 in words is "two hundred eighty-one billion, five hundred eighty-one million, one thousand, four".