31000000001 has 16 divisors (see below), whose sum is σ = 33148362240. Its totient is φ = 28918855680.

The previous prime is 30999999997. The next prime is 31000000027. The reversal of 31000000001 is 10000000013.

It is a cyclic number.

It is not a de Polignac number, because 31000000001 - 2² = 30999999997 is a prime.

It is a super-2 number, since 2×31000000001² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31000020001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5248616 + ... + 5254518.

It is an arithmetic number, because the mean of its divisors is an integer number (2071772640).

Almost surely, 2^31000000001 is an apocalyptic number.

It is an amenable number.

31000000001 is a deficient number, since it is larger than the sum of its proper divisors (2148362239).

31000000001 is a wasteful number, since it uses less digits than its factorization.

31000000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11536.

The product of its (nonzero) digits is 3, while the sum is 5.

Adding to 31000000001 its reverse (10000000013), we get a palindrome (41000000014).

It can be divided in two parts, 3 and 1000000001, that multiplied together give a palindrome (3000000003).

The spelling of 31000000001 in words is "thirty-one billion, one", and thus it is an aban number and an uban number.