136660431 has 8 divisors (see below), whose sum is σ = 188091904. Its totient is φ = 88167960.

The previous prime is 136660427. The next prime is 136660451. The reversal of 136660431 is 134066631.

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

It is not a de Polignac number, because 136660431 - 2² = 136660427 is a prime.

It is a super-2 number, since 2×136660431² = 37352146802211522, 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 (136660451) by changing a digit.

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, 734641 + ... + 734826.

It is an arithmetic number, because the mean of its divisors is an integer number (23511488).

Almost surely, 2^136660431 is an apocalyptic number.

136660431 is a deficient number, since it is larger than the sum of its proper divisors (51431473).

136660431 is a wasteful number, since it uses less digits than its factorization.

136660431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1469501.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 136660431 is about 11690.1852423304. The cubic root of 136660431 is about 515.0874027671.

The spelling of 136660431 in words is "one hundred thirty-six million, six hundred sixty thousand, four hundred thirty-one".