135521051 has 2 divisors, whose sum is σ = 135521052. Its totient is φ = 135521050.

The previous prime is 135521039. The next prime is 135521063. The reversal of 135521051 is 150125531.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (135521039) and next prime (135521063).

It is a cyclic number.

It is not a de Polignac number, because 135521051 - 2²² = 131326747 is a prime.

It is not a weakly prime, because it can be changed into another prime (135521011) 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, 67760525 + 67760526.

It is an arithmetic number, because the mean of its divisors is an integer number (67760526).

Almost surely, 2^135521051 is an apocalyptic number.

135521051 is a deficient number, since it is larger than the sum of its proper divisors (1).

135521051 is an equidigital number, since it uses as much as digits as its factorization.

135521051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 135521051 is about 11641.3509095809. The cubic root of 135521051 is about 513.6519253631.

Adding to 135521051 its reverse (150125531), we get a palindrome (285646582).

The spelling of 135521051 in words is "one hundred thirty-five million, five hundred twenty-one thousand, fifty-one".