31011101332381 has 2 divisors, whose sum is σ = 31011101332382. Its totient is φ = 31011101332380.

The previous prime is 31011101332301. The next prime is 31011101332391. The reversal of 31011101332381 is 18323310111013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18199319116356 + 12811782216025 = 4266066^2 + 3579355^2 .

It is a cyclic number.

It is not a de Polignac number, because 31011101332381 - 2³³ = 31002511397789 is a prime.

It is a super-2 number, since 2×31011101332381² (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 (31011101332301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15505550666190 + 15505550666191.

It is an arithmetic number, because the mean of its divisors is an integer number (15505550666191).

Almost surely, 2^{31011101332381} is an apocalyptic number.

It is an amenable number.

31011101332381 is a deficient number, since it is larger than the sum of its proper divisors (1).

31011101332381 is an equidigital number, since it uses as much as digits as its factorization.

31011101332381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

Adding to 31011101332381 its reverse (18323310111013), we get a palindrome (49334411443394).

The spelling of 31011101332381 in words is "thirty-one trillion, eleven billion, one hundred one million, three hundred thirty-two thousand, three hundred eighty-one".