281117961513 has 12 divisors (see below), whose sum is σ = 406479206848. Its totient is φ = 187218160920.

The previous prime is 281117961433. The next prime is 281117961521. The reversal of 281117961513 is 315169711182.

281117961513 is a `hidden beast` number, since 2 + 8 + 1 + 1 + 1 + 79 + 61 + 513 = 666.

It is not a de Polignac number, because 281117961513 - 2¹⁶ = 281117895977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (281117961533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16141933 + ... + 16159338.

Almost surely, 2^281117961513 is an apocalyptic number.

It is an amenable number.

281117961513 is a deficient number, since it is larger than the sum of its proper divisors (125361245335).

281117961513 is a wasteful number, since it uses less digits than its factorization.

281117961513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32302244 (or 32302241 counting only the distinct ones).

The product of its digits is 90720, while the sum is 45.

The spelling of 281117961513 in words is "two hundred eighty-one billion, one hundred seventeen million, nine hundred sixty-one thousand, five hundred thirteen".