28131161513 has 36 divisors (see below), whose sum is σ = 36578262528. Its totient is φ = 21539437920.

The previous prime is 28131161507. The next prime is 28131161551. The reversal of 28131161513 is 31516113182.

It is not a de Polignac number, because 28131161513 - 2¹⁴ = 28131145129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28131161513.

It is not an unprimeable number, because it can be changed into a prime (28131161503) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 201920 + ... + 311502.

It is an arithmetic number, because the mean of its divisors is an integer number (1016062848).

Almost surely, 2^28131161513 is an apocalyptic number.

It is an amenable number.

28131161513 is a deficient number, since it is larger than the sum of its proper divisors (8447101015).

28131161513 is a wasteful number, since it uses less digits than its factorization.

28131161513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109654 (or 109634 counting only the distinct ones).

The product of its digits is 4320, while the sum is 32.

Adding to 28131161513 its reverse (31516113182), we get a palindrome (59647274695).

The spelling of 28131161513 in words is "twenty-eight billion, one hundred thirty-one million, one hundred sixty-one thousand, five hundred thirteen".