135690421 has 2 divisors, whose sum is σ = 135690422. Its totient is φ = 135690420.

The previous prime is 135690367. The next prime is 135690431. The reversal of 135690421 is 124096531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71064900 + 64625521 = 8430^2 + 8039^2 .

It is a cyclic number.

It is not a de Polignac number, because 135690421 - 2¹³ = 135682229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135690431) 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, 67845210 + 67845211.

It is an arithmetic number, because the mean of its divisors is an integer number (67845211).

Almost surely, 2^135690421 is an apocalyptic number.

It is an amenable number.

135690421 is a deficient number, since it is larger than the sum of its proper divisors (1).

135690421 is an equidigital number, since it uses as much as digits as its factorization.

135690421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 135690421 is about 11648.6231375214. The cubic root of 135690421 is about 513.8658183560.

The spelling of 135690421 in words is "one hundred thirty-five million, six hundred ninety thousand, four hundred twenty-one".