136558997 has 4 divisors (see below), whose sum is σ = 137555916. Its totient is φ = 135562080.

The previous prime is 136558993. The next prime is 136559029. The reversal of 136558997 is 799855631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 799855631 = 3761 ⋅212671.

It can be written as a sum of positive squares in 2 ways, for example, as 31516996 + 105042001 = 5614^2 + 10249^2 .

It is a cyclic number.

It is not a de Polignac number, because 136558997 - 2² = 136558993 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136558993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498254 + ... + 498527.

It is an arithmetic number, because the mean of its divisors is an integer number (34388979).

Almost surely, 2^136558997 is an apocalyptic number.

It is an amenable number.

136558997 is a deficient number, since it is larger than the sum of its proper divisors (996919).

136558997 is an equidigital number, since it uses as much as digits as its factorization.

136558997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996918.

The product of its digits is 2041200, while the sum is 53.

The square root of 136558997 is about 11685.8460113079. The cubic root of 136558997 is about 514.9599327863.

The spelling of 136558997 in words is "one hundred thirty-six million, five hundred fifty-eight thousand, nine hundred ninety-seven".