136561123 has 2 divisors, whose sum is σ = 136561124. Its totient is φ = 136561122.

The previous prime is 136561121. The next prime is 136561133. The reversal of 136561123 is 321165631.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 136561123 - 2¹ = 136561121 is a prime.

It is a super-2 number, since 2×136561123² = 37297880630042258, which contains 22 as substring.

Together with 136561121, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 136561091 and 136561100.

It is not a weakly prime, because it can be changed into another prime (136561121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68280561 + 68280562.

It is an arithmetic number, because the mean of its divisors is an integer number (68280562).

Almost surely, 2^136561123 is an apocalyptic number.

136561123 is a deficient number, since it is larger than the sum of its proper divisors (1).

136561123 is an equidigital number, since it uses as much as digits as its factorization.

136561123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 28.

The square root of 136561123 is about 11685.9369756986. The cubic root of 136561123 is about 514.9626051335.

The spelling of 136561123 in words is "one hundred thirty-six million, five hundred sixty-one thousand, one hundred twenty-three".