136509761 has 16 divisors (see below), whose sum is σ = 149451264. Its totient is φ = 124305984.

The previous prime is 136509739. The next prime is 136509797. The reversal of 136509761 is 167905631.

It is not a de Polignac number, because 136509761 - 2⁶ = 136509697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136509701) 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 15 ways as a sum of consecutive naturals, for example, 38291 + ... + 41703.

It is an arithmetic number, because the mean of its divisors is an integer number (9340704).

Almost surely, 2^136509761 is an apocalyptic number.

It is an amenable number.

136509761 is a deficient number, since it is larger than the sum of its proper divisors (12941503).

136509761 is a wasteful number, since it uses less digits than its factorization.

136509761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3520.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 136509761 is about 11683.7391703170. The cubic root of 136509761 is about 514.8980361810.

The spelling of 136509761 in words is "one hundred thirty-six million, five hundred nine thousand, seven hundred sixty-one".