135856961 has 4 divisors (see below), whose sum is σ = 135897300. Its totient is φ = 135816624.

The previous prime is 135856957. The next prime is 135856969. The reversal of 135856961 is 169658531.

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 87984400 + 47872561 = 9380^2 + 6919^2 .

It is a cyclic number.

It is not a de Polignac number, because 135856961 - 2² = 135856957 is a prime.

It is a super-2 number, since 2×135856961² = 36914227704311042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135856969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14606 + ... + 22023.

It is an arithmetic number, because the mean of its divisors is an integer number (33974325).

Almost surely, 2^135856961 is an apocalyptic number.

It is an amenable number.

135856961 is a deficient number, since it is larger than the sum of its proper divisors (40339).

135856961 is an equidigital number, since it uses as much as digits as its factorization.

135856961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40338.

The product of its digits is 194400, while the sum is 44.

The square root of 135856961 is about 11655.7694297717. The cubic root of 135856961 is about 514.0759639326.

The spelling of 135856961 in words is "one hundred thirty-five million, eight hundred fifty-six thousand, nine hundred sixty-one".