135661897 has 16 divisors (see below), whose sum is σ = 157132800. Its totient is φ = 114725520.

The previous prime is 135661879. The next prime is 135661937. The reversal of 135661897 is 798166531.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-135661897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135661837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 218854 + ... + 219472.

It is an arithmetic number, because the mean of its divisors is an integer number (9820800).

Almost surely, 2^135661897 is an apocalyptic number.

It is an amenable number.

135661897 is a deficient number, since it is larger than the sum of its proper divisors (21470903).

135661897 is a wasteful number, since it uses less digits than its factorization.

135661897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996.

The product of its digits is 272160, while the sum is 46.

The square root of 135661897 is about 11647.3987224616. The cubic root of 135661897 is about 513.8298086026.

The spelling of 135661897 in words is "one hundred thirty-five million, six hundred sixty-one thousand, eight hundred ninety-seven".