31000032101 has 12 divisors (see below), whose sum is σ = 31312552452. Its totient is φ = 30689599488.

The previous prime is 31000032061. The next prime is 31000032113. The reversal of 31000032101 is 10123000013.

It can be written as a sum of positive squares in 6 ways, for example, as 27647043076 + 3352989025 = 166274^2 + 57905^2 .

It is a de Polignac number, because none of the positive numbers 2^k-31000032101 is a prime.

It is a super-2 number, since 2×31000032101² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31000032121) 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, 11425121 + ... + 11427833.

It is an arithmetic number, because the mean of its divisors is an integer number (2609379371).

Almost surely, 2^31000032101 is an apocalyptic number.

It is an amenable number.

31000032101 is a deficient number, since it is larger than the sum of its proper divisors (312520351).

31000032101 is an equidigital number, since it uses as much as digits as its factorization.

31000032101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3400 (or 3143 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 11.

Adding to 31000032101 its reverse (10123000013), we get a palindrome (41123032114).

The spelling of 31000032101 in words is "thirty-one billion, thirty-two thousand, one hundred one".