135421251 has 12 divisors (see below), whose sum is σ = 210041352. Its totient is φ = 77383488.

The previous prime is 135421249. The next prime is 135421301. The reversal of 135421251 is 152124531.

It is a happy number.

It is not a de Polignac number, because 135421251 - 2¹ = 135421249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (135426251) 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 in 11 ways as a sum of consecutive naturals, for example, 460470 + ... + 460763.

It is an arithmetic number, because the mean of its divisors is an integer number (17503446).

Almost surely, 2^135421251 is an apocalyptic number.

135421251 is a deficient number, since it is larger than the sum of its proper divisors (74620101).

135421251 is an equidigital number, since it uses as much as digits as its factorization.

135421251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921250 (or 921243 counting only the distinct ones).

The product of its digits is 1200, while the sum is 24.

The square root of 135421251 is about 11637.0636760310. The cubic root of 135421251 is about 513.5258070702.

Adding to 135421251 its reverse (152124531), we get a palindrome (287545782).

The spelling of 135421251 in words is "one hundred thirty-five million, four hundred twenty-one thousand, two hundred fifty-one".