135406961 has 4 divisors (see below), whose sum is σ = 135432612. Its totient is φ = 135381312.

The previous prime is 135406951. The next prime is 135406987. The reversal of 135406961 is 169604531.

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 17901361 + 117505600 = 4231^2 + 10840^2 .

It is a cyclic number.

It is not a de Polignac number, because 135406961 - 2²² = 131212657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135406951) 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, 1676 + ... + 16541.

It is an arithmetic number, because the mean of its divisors is an integer number (33858153).

Almost surely, 2^135406961 is an apocalyptic number.

It is an amenable number.

135406961 is a deficient number, since it is larger than the sum of its proper divisors (25651).

135406961 is an equidigital number, since it uses as much as digits as its factorization.

135406961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25650.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 135406961 is about 11636.4496733325. The cubic root of 135406961 is about 513.5077435785.

The spelling of 135406961 in words is "one hundred thirty-five million, four hundred six thousand, nine hundred sixty-one".