31301332211381 has 2 divisors, whose sum is σ = 31301332211382. Its totient is φ = 31301332211380.

The previous prime is 31301332211323. The next prime is 31301332211389. The reversal of 31301332211381 is 18311223310313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31234350112900 + 66982098481 = 5588770^2 + 258809^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31301332211381 is a prime.

It is a super-2 number, since 2×31301332211381² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31301332211389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15650666105690 + 15650666105691.

It is an arithmetic number, because the mean of its divisors is an integer number (15650666105691).

Almost surely, 2^{31301332211381} is an apocalyptic number.

It is an amenable number.

31301332211381 is a deficient number, since it is larger than the sum of its proper divisors (1).

31301332211381 is an equidigital number, since it uses as much as digits as its factorization.

31301332211381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 32.

Adding to 31301332211381 its reverse (18311223310313), we get a palindrome (49612555521694).

The spelling of 31301332211381 in words is "thirty-one trillion, three hundred one billion, three hundred thirty-two million, two hundred eleven thousand, three hundred eighty-one".