136821556 has 6 divisors (see below), whose sum is σ = 239437730. Its totient is φ = 68410776.

The previous prime is 136821547. The next prime is 136821563. The reversal of 136821556 is 655128631.

136821556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 115347600 + 21473956 = 10740^2 + 4634^2 .

It is a super-2 number, since 2×136821556² = 37440276372522272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17102691 + ... + 17102698.

Almost surely, 2^136821556 is an apocalyptic number.

It is an amenable number.

136821556 is a deficient number, since it is larger than the sum of its proper divisors (102616174).

136821556 is a wasteful number, since it uses less digits than its factorization.

136821556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34205393 (or 34205391 counting only the distinct ones).

The product of its digits is 43200, while the sum is 37.

The square root of 136821556 is about 11697.0746770293. The cubic root of 136821556 is about 515.2897555662.

The spelling of 136821556 in words is "one hundred thirty-six million, eight hundred twenty-one thousand, five hundred fifty-six".