131211210120077 has 2 divisors, whose sum is σ = 131211210120078. Its totient is φ = 131211210120076.

The previous prime is 131211210120037. The next prime is 131211210120091. The reversal of 131211210120077 is 770021012112131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78291244918756 + 52919965201321 = 8848234^2 + 7274611^2 .

It is a cyclic number.

It is not a de Polignac number, because 131211210120077 - 2¹⁸ = 131211209857933 is a prime.

It is a super-2 number, since 2×131211210120077² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131211210120037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65605605060038 + 65605605060039.

It is an arithmetic number, because the mean of its divisors is an integer number (65605605060039).

Almost surely, 2^{131211210120077} is an apocalyptic number.

It is an amenable number.

131211210120077 is a deficient number, since it is larger than the sum of its proper divisors (1).

131211210120077 is an equidigital number, since it uses as much as digits as its factorization.

131211210120077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1176, while the sum is 29.

The spelling of 131211210120077 in words is "one hundred thirty-one trillion, two hundred eleven billion, two hundred ten million, one hundred twenty thousand, seventy-seven".