135421357 has 2 divisors, whose sum is σ = 135421358. Its totient is φ = 135421356.

The previous prime is 135421327. The next prime is 135421367. The reversal of 135421357 is 753124531.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131928196 + 3493161 = 11486^2 + 1869^2 .

It is a cyclic number.

It is not a de Polignac number, because 135421357 - 2⁷ = 135421229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135421327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67710678 + 67710679.

It is an arithmetic number, because the mean of its divisors is an integer number (67710679).

Almost surely, 2^135421357 is an apocalyptic number.

It is an amenable number.

135421357 is a deficient number, since it is larger than the sum of its proper divisors (1).

135421357 is an equidigital number, since it uses as much as digits as its factorization.

135421357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12600, while the sum is 31.

The square root of 135421357 is about 11637.0682304436. The cubic root of 135421357 is about 513.5259410564.

Adding to 135421357 its reverse (753124531), we get a palindrome (888545888).

The spelling of 135421357 in words is "one hundred thirty-five million, four hundred twenty-one thousand, three hundred fifty-seven".