31000030121131 has 2 divisors, whose sum is σ = 31000030121132. Its totient is φ = 31000030121130.

The previous prime is 31000030121051. The next prime is 31000030121197. The reversal of 31000030121131 is 13112103000013.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31000030121131 - 2¹³ = 31000030112939 is a prime.

It is a super-2 number, since 2×31000030121131² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31000030121231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15500015060565 + 15500015060566.

It is an arithmetic number, because the mean of its divisors is an integer number (15500015060566).

Almost surely, 2^{31000030121131} is an apocalyptic number.

31000030121131 is a deficient number, since it is larger than the sum of its proper divisors (1).

31000030121131 is an equidigital number, since it uses as much as digits as its factorization.

31000030121131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 31000030121131 its reverse (13112103000013), we get a palindrome (44112133121144).

The spelling of 31000030121131 in words is "thirty-one trillion, thirty million, one hundred twenty-one thousand, one hundred thirty-one".