135240251403 has 4 divisors (see below), whose sum is σ = 180320335208. Its totient is φ = 90160167600.

The previous prime is 135240251389. The next prime is 135240251423. The reversal of 135240251403 is 304152042531.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 135240251403 - 2⁶ = 135240251339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135240251423) 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, 22540041898 + ... + 22540041903.

It is an arithmetic number, because the mean of its divisors is an integer number (45080083802).

Almost surely, 2^135240251403 is an apocalyptic number.

135240251403 is a deficient number, since it is larger than the sum of its proper divisors (45080083805).

135240251403 is an equidigital number, since it uses as much as digits as its factorization.

135240251403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45080083804.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 135240251403 its reverse (304152042531), we get a palindrome (439392293934).

The spelling of 135240251403 in words is "one hundred thirty-five billion, two hundred forty million, two hundred fifty-one thousand, four hundred three".