131222421790661 has 2 divisors, whose sum is σ = 131222421790662. Its totient is φ = 131222421790660.

The previous prime is 131222421790657. The next prime is 131222421790777. The reversal of 131222421790661 is 166097124222131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88158391132900 + 43064030657761 = 9389270^2 + 6562319^2 .

It is a cyclic number.

It is not a de Polignac number, because 131222421790661 - 2² = 131222421790657 is a prime.

It is a super-2 number, since 2×131222421790661² (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 (131222421730661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65611210895330 + 65611210895331.

It is an arithmetic number, because the mean of its divisors is an integer number (65611210895331).

Almost surely, 2^{131222421790661} is an apocalyptic number.

It is an amenable number.

131222421790661 is a deficient number, since it is larger than the sum of its proper divisors (1).

131222421790661 is an equidigital number, since it uses as much as digits as its factorization.

131222421790661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 47.

The spelling of 131222421790661 in words is "one hundred thirty-one trillion, two hundred twenty-two billion, four hundred twenty-one million, seven hundred ninety thousand, six hundred sixty-one".