136924420981 has 2 divisors, whose sum is σ = 136924420982. Its totient is φ = 136924420980.

The previous prime is 136924420967. The next prime is 136924421093. The reversal of 136924420981 is 189024429631.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136892600100 + 31820881 = 369990^2 + 5641^2 .

It is a cyclic number.

It is not a de Polignac number, because 136924420981 - 2¹⁵ = 136924388213 is a prime.

It is a super-2 number, since 2×136924420981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136924420181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68462210490 + 68462210491.

It is an arithmetic number, because the mean of its divisors is an integer number (68462210491).

Almost surely, 2^136924420981 is an apocalyptic number.

It is an amenable number.

136924420981 is a deficient number, since it is larger than the sum of its proper divisors (1).

136924420981 is an equidigital number, since it uses as much as digits as its factorization.

136924420981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 746496, while the sum is 49.

The spelling of 136924420981 in words is "one hundred thirty-six billion, nine hundred twenty-four million, four hundred twenty thousand, nine hundred eighty-one".