121445673581 has 2 divisors, whose sum is σ = 121445673582. Its totient is φ = 121445673580.

The previous prime is 121445673551. The next prime is 121445673631. The reversal of 121445673581 is 185376544121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121336575556 + 109098025 = 348334^2 + 10445^2 .

It is a cyclic number.

It is not a de Polignac number, because 121445673581 - 2¹⁴ = 121445657197 is a prime.

It is a super-2 number, since 2×121445673581² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121445673521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60722836790 + 60722836791.

It is an arithmetic number, because the mean of its divisors is an integer number (60722836791).

Almost surely, 2^121445673581 is an apocalyptic number.

It is an amenable number.

121445673581 is a deficient number, since it is larger than the sum of its proper divisors (1).

121445673581 is an equidigital number, since it uses as much as digits as its factorization.

121445673581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 806400, while the sum is 47.

The spelling of 121445673581 in words is "one hundred twenty-one billion, four hundred forty-five million, six hundred seventy-three thousand, five hundred eighty-one".