31210010001 has 6 divisors (see below), whose sum is σ = 45081125570. Its totient is φ = 20806673328.

The previous prime is 31210009993. The next prime is 31210010021. The reversal of 31210010001 is 10001001213.

It can be written as a sum of positive squares in only one way, i.e., 24018800400 + 7191209601 = 154980^2 + 84801^2 .

It is not a de Polignac number, because 31210010001 - 2³ = 31210009993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 3467778889 = 31210010001 / (3 + 1 + 2 + 1 + 0 + 0 + 1 + 0 + 0 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31210010021) 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, 1733889436 + ... + 1733889453.

Almost surely, 2^31210010001 is an apocalyptic number.

It is an amenable number.

31210010001 is a deficient number, since it is larger than the sum of its proper divisors (13871115569).

31210010001 is a wasteful number, since it uses less digits than its factorization.

31210010001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3467778895 (or 3467778892 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

Adding to 31210010001 its reverse (10001001213), we get a palindrome (41211011214).

The spelling of 31210010001 in words is "thirty-one billion, two hundred ten million, ten thousand, one".