135229961 has 2 divisors, whose sum is σ = 135229962. Its totient is φ = 135229960.

The previous prime is 135229957. The next prime is 135229979. The reversal of 135229961 is 169922531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88717561 + 46512400 = 9419^2 + 6820^2 .

It is a cyclic number.

It is not a de Polignac number, because 135229961 - 2² = 135229957 is a prime.

It is not a weakly prime, because it can be changed into another prime (135229921) 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 as a sum of consecutive naturals, namely, 67614980 + 67614981.

It is an arithmetic number, because the mean of its divisors is an integer number (67614981).

Almost surely, 2^135229961 is an apocalyptic number.

It is an amenable number.

135229961 is a deficient number, since it is larger than the sum of its proper divisors (1).

135229961 is an equidigital number, since it uses as much as digits as its factorization.

135229961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 38.

The square root of 135229961 is about 11628.8417737967. The cubic root of 135229961 is about 513.2838986053.

It can be divided in two parts, 1352 and 29961, that added together give a palindrome (31313).

The spelling of 135229961 in words is "one hundred thirty-five million, two hundred twenty-nine thousand, nine hundred sixty-one".