136981645 has 8 divisors (see below), whose sum is σ = 170046360. Its totient is φ = 105806400.

The previous prime is 136981643. The next prime is 136981679. The reversal of 136981645 is 546189631.

It can be written as a sum of positive squares in 4 ways, for example, as 32512804 + 104468841 = 5702^2 + 10221^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 136981645 - 2¹ = 136981643 is a prime.

It is a super-3 number, since 3×136981645³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136981643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 472206 + ... + 472495.

It is an arithmetic number, because the mean of its divisors is an integer number (21255795).

Almost surely, 2^136981645 is an apocalyptic number.

It is an amenable number.

136981645 is a deficient number, since it is larger than the sum of its proper divisors (33064715).

136981645 is an equidigital number, since it uses as much as digits as its factorization.

136981645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944735.

The product of its digits is 155520, while the sum is 43.

The square root of 136981645 is about 11703.9157977149. The cubic root of 136981645 is about 515.4906500048.

The spelling of 136981645 in words is "one hundred thirty-six million, nine hundred eighty-one thousand, six hundred forty-five".