136123521 has 4 divisors (see below), whose sum is σ = 181498032. Its totient is φ = 90749012.

The previous prime is 136123517. The next prime is 136123523. The reversal of 136123521 is 125321631.

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: 125321631 = 3 ⋅41773877.

It is a cyclic number.

It is not a de Polignac number, because 136123521 - 2² = 136123517 is a prime.

It is a super-2 number, since 2×136123521² = 37059225938874882, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 136123491 and 136123500.

It is not an unprimeable number, because it can be changed into a prime (136123523) 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, 22687251 + ... + 22687256.

It is an arithmetic number, because the mean of its divisors is an integer number (45374508).

Almost surely, 2^136123521 is an apocalyptic number.

It is an amenable number.

136123521 is a deficient number, since it is larger than the sum of its proper divisors (45374511).

136123521 is an equidigital number, since it uses as much as digits as its factorization.

136123521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45374510.

The product of its digits is 1080, while the sum is 24.

The square root of 136123521 is about 11667.1985069253. The cubic root of 136123521 is about 514.4119608606.

The spelling of 136123521 in words is "one hundred thirty-six million, one hundred twenty-three thousand, five hundred twenty-one".