136925581 has 8 divisors (see below), whose sum is σ = 147755160. Its totient is φ = 126138432.

The previous prime is 136925557. The next prime is 136925597. The reversal of 136925581 is 185529631.

It can be written as a sum of positive squares in 4 ways, for example, as 43494025 + 93431556 = 6595^2 + 9666^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 136925581 - 2⁵ = 136925549 is a prime.

It is a super-2 number, since 2×136925581² = 37497229464375122, 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 (136925081) 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, 3730 + ... + 16963.

It is an arithmetic number, because the mean of its divisors is an integer number (18469395).

Almost surely, 2^136925581 is an apocalyptic number.

It is an amenable number.

136925581 is a deficient number, since it is larger than the sum of its proper divisors (10829579).

136925581 is a wasteful number, since it uses less digits than its factorization.

136925581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21215.

The product of its digits is 64800, while the sum is 40.

The square root of 136925581 is about 11701.5204567612. The cubic root of 136925581 is about 515.4203135460.

The spelling of 136925581 in words is "one hundred thirty-six million, nine hundred twenty-five thousand, five hundred eighty-one".