136351561 has 4 divisors (see below), whose sum is σ = 136870272. Its totient is φ = 135832852.

The previous prime is 136351541. The next prime is 136351571. The reversal of 136351561 is 165153631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 165153631 = 181 ⋅912451.

It is a cyclic number.

It is not a de Polignac number, because 136351561 - 2⁵ = 136351529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136351541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 258961 + ... + 259486.

It is an arithmetic number, because the mean of its divisors is an integer number (34217568).

Almost surely, 2^136351561 is an apocalyptic number.

It is an amenable number.

136351561 is a deficient number, since it is larger than the sum of its proper divisors (518711).

136351561 is an equidigital number, since it uses as much as digits as its factorization.

136351561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518710.

The product of its digits is 8100, while the sum is 31.

The square root of 136351561 is about 11676.9671147948. The cubic root of 136351561 is about 514.6990556452.

The spelling of 136351561 in words is "one hundred thirty-six million, three hundred fifty-one thousand, five hundred sixty-one".