31203123313 has 4 divisors (see below), whose sum is σ = 31232313460. Its totient is φ = 31173933168.

The previous prime is 31203123283. The next prime is 31203123317. The reversal of 31203123313 is 31332130213.

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 5566950544 + 25636172769 = 74612^2 + 160113^2 .

It is a cyclic number.

It is not a de Polignac number, because 31203123313 - 2⁹ = 31203122801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31203123317) 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, 14593470 + ... + 14595607.

It is an arithmetic number, because the mean of its divisors is an integer number (7808078365).

Almost surely, 2^31203123313 is an apocalyptic number.

It is an amenable number.

31203123313 is a deficient number, since it is larger than the sum of its proper divisors (29190147).

31203123313 is a wasteful number, since it uses less digits than its factorization.

31203123313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29190146.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 31203123313 its reverse (31332130213), we get a palindrome (62535253526).

The spelling of 31203123313 in words is "thirty-one billion, two hundred three million, one hundred twenty-three thousand, three hundred thirteen".