31000002001 has 4 divisors (see below), whose sum is σ = 31000418404. Its totient is φ = 30999585600.

The previous prime is 31000001987. The next prime is 31000002049. The reversal of 31000002001 is 10020000013.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29886111376 + 1113890625 = 172876^2 + 33375^2 .

It is a cyclic number.

It is not a de Polignac number, because 31000002001 - 2¹⁷ = 30999870929 is a prime.

It is a super-2 number, since 2×31000002001² (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 (31000002091) 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, 62580 + ... + 256741.

It is an arithmetic number, because the mean of its divisors is an integer number (7750104601).

Almost surely, 2^31000002001 is an apocalyptic number.

It is an amenable number.

31000002001 is a deficient number, since it is larger than the sum of its proper divisors (416403).

31000002001 is an equidigital number, since it uses as much as digits as its factorization.

31000002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416402.

The product of its (nonzero) digits is 6, while the sum is 7.

Adding to 31000002001 its reverse (10020000013), we get a palindrome (41020002014).

The spelling of 31000002001 in words is "thirty-one billion, two thousand, one".