31320012001 has 4 divisors (see below), whose sum is σ = 31350931092. Its totient is φ = 31289092912.

The previous prime is 31320011963. The next prime is 31320012011. The reversal of 31320012001 is 10021002313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10021002313 = 7 ⋅1431571759.

It can be written as a sum of positive squares in 2 ways, for example, as 9452700625 + 21867311376 = 97225^2 + 147876^2 .

It is a cyclic number.

It is not a de Polignac number, because 31320012001 - 2¹³ = 31320003809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31320012011) 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, 15458026 + ... + 15460051.

It is an arithmetic number, because the mean of its divisors is an integer number (7837732773).

Almost surely, 2^31320012001 is an apocalyptic number.

It is an amenable number.

31320012001 is a deficient number, since it is larger than the sum of its proper divisors (30919091).

31320012001 is a wasteful number, since it uses less digits than its factorization.

31320012001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30919090.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 31320012001 its reverse (10021002313), we get a palindrome (41341014314).

The spelling of 31320012001 in words is "thirty-one billion, three hundred twenty million, twelve thousand, one".