136228521 has 32 divisors (see below), whose sum is σ = 215534592. Its totient is φ = 75447360.

The previous prime is 136228511. The next prime is 136228523. The reversal of 136228521 is 125822631.

136228521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 136228521 - 2⁵ = 136228489 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (136228523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42646 + ... + 45728.

It is an arithmetic number, because the mean of its divisors is an integer number (6735456).

Almost surely, 2^136228521 is an apocalyptic number.

136228521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

136228521 is a deficient number, since it is larger than the sum of its proper divisors (79306071).

136228521 is a wasteful number, since it uses less digits than its factorization.

136228521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3213.

The product of its digits is 5760, while the sum is 30.

The square root of 136228521 is about 11671.6974343923. The cubic root of 136228521 is about 514.5441921693.

The spelling of 136228521 in words is "one hundred thirty-six million, two hundred twenty-eight thousand, five hundred twenty-one".