135521410 has 8 divisors (see below), whose sum is σ = 243938556. Its totient is φ = 54208560.

The previous prime is 135521389. The next prime is 135521413. The reversal of 135521410 is 14125531.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 129572689 + 5948721 = 11383^2 + 2439^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (135521413) 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, 6776061 + ... + 6776080.

Almost surely, 2^135521410 is an apocalyptic number.

135521410 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

135521410 is a deficient number, since it is larger than the sum of its proper divisors (108417146).

135521410 is a wasteful number, since it uses less digits than its factorization.

135521410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13552148.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 135521410 is about 11641.3663287434. The cubic root of 135521410 is about 513.6523789233.

Adding to 135521410 its reverse (14125531), we get a palindrome (149646941).

The spelling of 135521410 in words is "one hundred thirty-five million, five hundred twenty-one thousand, four hundred ten".