31115121151 has 2 divisors, whose sum is σ = 31115121152. Its totient is φ = 31115121150.

The previous prime is 31115121137. The next prime is 31115121157. The reversal of 31115121151 is 15112151113.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31115121151 - 2¹⁵ = 31115088383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31115121157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15557560575 + 15557560576.

It is an arithmetic number, because the mean of its divisors is an integer number (15557560576).

Almost surely, 2^31115121151 is an apocalyptic number.

31115121151 is a deficient number, since it is larger than the sum of its proper divisors (1).

31115121151 is an equidigital number, since it uses as much as digits as its factorization.

31115121151 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 150, while the sum is 22.

Adding to 31115121151 its reverse (15112151113), we get a palindrome (46227272264).

The spelling of 31115121151 in words is "thirty-one billion, one hundred fifteen million, one hundred twenty-one thousand, one hundred fifty-one".