135985940381 has 2 divisors, whose sum is σ = 135985940382. Its totient is φ = 135985940380.

The previous prime is 135985940359. The next prime is 135985940413. The reversal of 135985940381 is 183049589531.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132317700025 + 3668240356 = 363755^2 + 60566^2 .

It is an emirp because it is prime and its reverse (183049589531) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135985940381 is a prime.

It is a super-2 number, since 2×135985940381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135985948381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67992970190 + 67992970191.

It is an arithmetic number, because the mean of its divisors is an integer number (67992970191).

Almost surely, 2^135985940381 is an apocalyptic number.

It is an amenable number.

135985940381 is a deficient number, since it is larger than the sum of its proper divisors (1).

135985940381 is an equidigital number, since it uses as much as digits as its factorization.

135985940381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4665600, while the sum is 56.

The spelling of 135985940381 in words is "one hundred thirty-five billion, nine hundred eighty-five million, nine hundred forty thousand, three hundred eighty-one".