136955981 has 4 divisors (see below), whose sum is σ = 140657532. Its totient is φ = 133254432.

The previous prime is 136955941. The next prime is 136955983. The reversal of 136955981 is 189559631.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 89000356 + 47955625 = 9434^2 + 6925^2 .

It is a cyclic number.

It is not a de Polignac number, because 136955981 - 2²² = 132761677 is a prime.

It is a super-2 number, since 2×136955981² = 37513881463344722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136955983) 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 3 ways as a sum of consecutive naturals, for example, 1850720 + ... + 1850793.

It is an arithmetic number, because the mean of its divisors is an integer number (35164383).

Almost surely, 2^136955981 is an apocalyptic number.

It is an amenable number.

136955981 is a deficient number, since it is larger than the sum of its proper divisors (3701551).

136955981 is an equidigital number, since it uses as much as digits as its factorization.

136955981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3701550.

The product of its digits is 291600, while the sum is 47.

The square root of 136955981 is about 11702.8193611625. The cubic root of 136955981 is about 515.4584549898.

The spelling of 136955981 in words is "one hundred thirty-six million, nine hundred fifty-five thousand, nine hundred eighty-one".