31123440077 has 2 divisors, whose sum is σ = 31123440078. Its totient is φ = 31123440076.

The previous prime is 31123440037. The next prime is 31123440121. The reversal of 31123440077 is 77004432113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16948394596 + 14175045481 = 130186^2 + 119059^2 .

It is a cyclic number.

It is not a de Polignac number, because 31123440077 - 2¹⁸ = 31123177933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31123440037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15561720038 + 15561720039.

It is an arithmetic number, because the mean of its divisors is an integer number (15561720039).

Almost surely, 2^31123440077 is an apocalyptic number.

It is an amenable number.

31123440077 is a deficient number, since it is larger than the sum of its proper divisors (1).

31123440077 is an equidigital number, since it uses as much as digits as its factorization.

31123440077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 32.

The spelling of 31123440077 in words is "thirty-one billion, one hundred twenty-three million, four hundred forty thousand, seventy-seven".