135921992761 has 2 divisors, whose sum is σ = 135921992762. Its totient is φ = 135921992760.

The previous prime is 135921992749. The next prime is 135921992809. The reversal of 135921992761 is 167299129531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135226088361 + 695904400 = 367731^2 + 26380^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135921992761 is a prime.

It is a super-3 number, since 3×135921992761³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (135921972761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67960996380 + 67960996381.

It is an arithmetic number, because the mean of its divisors is an integer number (67960996381).

Almost surely, 2^135921992761 is an apocalyptic number.

It is an amenable number.

135921992761 is a deficient number, since it is larger than the sum of its proper divisors (1).

135921992761 is an equidigital number, since it uses as much as digits as its factorization.

135921992761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1837080, while the sum is 55.

The spelling of 135921992761 in words is "one hundred thirty-five billion, nine hundred twenty-one million, nine hundred ninety-two thousand, seven hundred sixty-one".