135421650181 has 2 divisors, whose sum is σ = 135421650182. Its totient is φ = 135421650180.

The previous prime is 135421650107. The next prime is 135421650197. The reversal of 135421650181 is 181056124531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108985816900 + 26435833281 = 330130^2 + 162591^2 .

It is a cyclic number.

It is not a de Polignac number, because 135421650181 - 2⁷ = 135421650053 is a prime.

It is a super-2 number, since 2×135421650181² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 135421650181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135421650781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67710825090 + 67710825091.

It is an arithmetic number, because the mean of its divisors is an integer number (67710825091).

Almost surely, 2^135421650181 is an apocalyptic number.

It is an amenable number.

135421650181 is a deficient number, since it is larger than the sum of its proper divisors (1).

135421650181 is an equidigital number, since it uses as much as digits as its factorization.

135421650181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 37.

The spelling of 135421650181 in words is "one hundred thirty-five billion, four hundred twenty-one million, six hundred fifty thousand, one hundred eighty-one".