31028312001 has 4 divisors (see below), whose sum is σ = 41371082672. Its totient is φ = 20685541332.

The previous prime is 31028311967. The next prime is 31028312011. The reversal of 31028312001 is 10021382013.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 31028312001 - 2¹¹ = 31028309953 is a prime.

It is a super-2 number, since 2×31028312001² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31028312011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5171385331 + ... + 5171385336.

It is an arithmetic number, because the mean of its divisors is an integer number (10342770668).

Almost surely, 2^31028312001 is an apocalyptic number.

It is an amenable number.

31028312001 is a deficient number, since it is larger than the sum of its proper divisors (10342770671).

31028312001 is a wasteful number, since it uses less digits than its factorization.

31028312001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10342770670.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 31028312001 its reverse (10021382013), we get a palindrome (41049694014).

The spelling of 31028312001 in words is "thirty-one billion, twenty-eight million, three hundred twelve thousand, one".