31012301081 has 2 divisors, whose sum is σ = 31012301082. Its totient is φ = 31012301080.

The previous prime is 31012300961. The next prime is 31012301147. The reversal of 31012301081 is 18010321013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21591657481 + 9420643600 = 146941^2 + 97060^2 .

It is a cyclic number.

It is not a de Polignac number, because 31012301081 - 2¹⁰ = 31012300057 is a prime.

It is a super-2 number, since 2×31012301081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31012301681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15506150540 + 15506150541.

It is an arithmetic number, because the mean of its divisors is an integer number (15506150541).

Almost surely, 2^31012301081 is an apocalyptic number.

It is an amenable number.

31012301081 is a deficient number, since it is larger than the sum of its proper divisors (1).

31012301081 is an equidigital number, since it uses as much as digits as its factorization.

31012301081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 31012301081 its reverse (18010321013), we get a palindrome (49022622094).

The spelling of 31012301081 in words is "thirty-one billion, twelve million, three hundred one thousand, eighty-one".