122031278665781 has 2 divisors, whose sum is σ = 122031278665782. Its totient is φ = 122031278665780.

The previous prime is 122031278665691. The next prime is 122031278665823. The reversal of 122031278665781 is 187566872130221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119977190628100 + 2054088037681 = 10953410^2 + 1433209^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122031278665781 is a prime.

It is a super-2 number, since 2×122031278665781² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 122031278665781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122031278665981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61015639332890 + 61015639332891.

It is an arithmetic number, because the mean of its divisors is an integer number (61015639332891).

Almost surely, 2^{122031278665781} is an apocalyptic number.

It is an amenable number.

122031278665781 is a deficient number, since it is larger than the sum of its proper divisors (1).

122031278665781 is an equidigital number, since it uses as much as digits as its factorization.

122031278665781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13547520, while the sum is 59.

The spelling of 122031278665781 in words is "one hundred twenty-two trillion, thirty-one billion, two hundred seventy-eight million, six hundred sixty-five thousand, seven hundred eighty-one".