28313131401 has 6 divisors (see below), whose sum is σ = 40896745370. Its totient is φ = 18875420928.

The previous prime is 28313131369. The next prime is 28313131463. The reversal of 28313131401 is 10413131382.

It can be written as a sum of positive squares in only one way, i.e., 16130270025 + 12182861376 = 127005^2 + 110376^2 .

It is not a de Polignac number, because 28313131401 - 2⁵ = 28313131369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28313131801) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1572951736 + ... + 1572951753.

Almost surely, 2^28313131401 is an apocalyptic number.

It is an amenable number.

28313131401 is a deficient number, since it is larger than the sum of its proper divisors (12583613969).

28313131401 is a wasteful number, since it uses less digits than its factorization.

28313131401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3145903495 (or 3145903492 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

Adding to 28313131401 its reverse (10413131382), we get a palindrome (38726262783).

The spelling of 28313131401 in words is "twenty-eight billion, three hundred thirteen million, one hundred thirty-one thousand, four hundred one".