287144795981 has 16 divisors (see below), whose sum is σ = 326275171200. Its totient is φ = 251231859648.

The previous prime is 287144795963. The next prime is 287144795983. The reversal of 287144795981 is 189597441782.

It is a cyclic number.

It is not a de Polignac number, because 287144795981 - 2¹⁰ = 287144794957 is a prime.

It is a super-2 number, since 2×287144795981² (a number of 24 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 (287144795983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11316326 + ... + 11341671.

It is an arithmetic number, because the mean of its divisors is an integer number (20392198200).

Almost surely, 2^287144795981 is an apocalyptic number.

It is an amenable number.

287144795981 is a deficient number, since it is larger than the sum of its proper divisors (39130375219).

287144795981 is a wasteful number, since it uses less digits than its factorization.

287144795981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22658068.

The product of its digits is 40642560, while the sum is 65.

The spelling of 287144795981 in words is "two hundred eighty-seven billion, one hundred forty-four million, seven hundred ninety-five thousand, nine hundred eighty-one".