31031000001 has 12 divisors (see below), whose sum is σ = 44842235620. Its totient is φ = 20678250240.

The previous prime is 31030999939. The next prime is 31031000003. The reversal of 31031000001 is 10000013013.

It can be written as a sum of positive squares in 2 ways, for example, as 24025310001 + 7005690000 = 155001^2 + 83700^2 .

It is not a de Polignac number, because 31031000001 - 2⁷ = 31030999873 is a prime.

It is a super-2 number, since 2×31031000001² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31031000003) 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, 735256 + ... + 776313.

Almost surely, 2^31031000001 is an apocalyptic number.

It is an amenable number.

31031000001 is a deficient number, since it is larger than the sum of its proper divisors (13811235619).

31031000001 is a wasteful number, since it uses less digits than its factorization.

31031000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1513856 (or 1513853 counting only the distinct ones).

The product of its (nonzero) digits is 9, while the sum is 9.

Adding to 31031000001 its reverse (10000013013), we get a palindrome (41031013014).

The spelling of 31031000001 in words is "thirty-one billion, thirty-one million, one", and thus it is an aban number and an uban number.