135821145 has 16 divisors (see below), whose sum is σ = 220066560. Its totient is φ = 71520384.

The previous prime is 135821131. The next prime is 135821149. The reversal of 135821145 is 541128531.

It is not a de Polignac number, because 135821145 - 2⁵ = 135821113 is a prime.

It is a super-2 number, since 2×135821145² = 36894766858222050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (135821149) 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 in 15 ways as a sum of consecutive naturals, for example, 56124 + ... + 58493.

It is an arithmetic number, because the mean of its divisors is an integer number (13754160).

Almost surely, 2^135821145 is an apocalyptic number.

135821145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

135821145 is a deficient number, since it is larger than the sum of its proper divisors (84245415).

135821145 is a wasteful number, since it uses less digits than its factorization.

135821145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114704.

The product of its digits is 4800, while the sum is 30.

The square root of 135821145 is about 11654.2329219902. The cubic root of 135821145 is about 514.0307846430.

Adding to 135821145 its reverse (541128531), we get a palindrome (676949676).

The spelling of 135821145 in words is "one hundred thirty-five million, eight hundred twenty-one thousand, one hundred forty-five".