31121030320313 has 4 divisors (see below), whose sum is σ = 32758979284560. Its totient is φ = 29483081356068.

The previous prime is 31121030320297. The next prime is 31121030320321. The reversal of 31121030320313 is 31302303012113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31121030320313 - 2⁴ = 31121030320297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31121030320343) 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, 818974482095 + ... + 818974482132.

It is an arithmetic number, because the mean of its divisors is an integer number (8189744821140).

Almost surely, 2^{31121030320313} is an apocalyptic number.

It is an amenable number.

31121030320313 is a deficient number, since it is larger than the sum of its proper divisors (1637948964247).

31121030320313 is a wasteful number, since it uses less digits than its factorization.

31121030320313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1637948964246.

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 31121030320313 its reverse (31302303012113), we get a palindrome (62423333332426).

The spelling of 31121030320313 in words is "thirty-one trillion, one hundred twenty-one billion, thirty million, three hundred twenty thousand, three hundred thirteen".