136168521091 has 2 divisors, whose sum is σ = 136168521092. Its totient is φ = 136168521090.

The previous prime is 136168521061. The next prime is 136168521101. The reversal of 136168521091 is 190125861631.

It is a strong prime.

It is an emirp because it is prime and its reverse (190125861631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136168521091 - 2⁵ = 136168521059 is a prime.

It is a super-2 number, since 2×136168521091² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (136168521001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68084260545 + 68084260546.

It is an arithmetic number, because the mean of its divisors is an integer number (68084260546).

Almost surely, 2^136168521091 is an apocalyptic number.

136168521091 is a deficient number, since it is larger than the sum of its proper divisors (1).

136168521091 is an equidigital number, since it uses as much as digits as its factorization.

136168521091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 43.

The spelling of 136168521091 in words is "one hundred thirty-six billion, one hundred sixty-eight million, five hundred twenty-one thousand, ninety-one".