136821634 has 16 divisors (see below), whose sum is σ = 212211000. Its totient is φ = 66109824.

The previous prime is 136821583. The next prime is 136821689. The reversal of 136821634 is 436128631.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 80946009 + 55875625 = 8997^2 + 7475^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 136821634.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4822 + ... + 17230.

Almost surely, 2^136821634 is an apocalyptic number.

136821634 is a deficient number, since it is larger than the sum of its proper divisors (75389366).

136821634 is a wasteful number, since it uses less digits than its factorization.

136821634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12597.

The product of its digits is 20736, while the sum is 34.

The square root of 136821634 is about 11697.0780111958. The cubic root of 136821634 is about 515.2898534859.

The spelling of 136821634 in words is "one hundred thirty-six million, eight hundred twenty-one thousand, six hundred thirty-four".