134513631821 has 2 divisors, whose sum is σ = 134513631822. Its totient is φ = 134513631820.

The previous prime is 134513631797. The next prime is 134513631869. The reversal of 134513631821 is 128136315431.

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., 77779632100 + 56733999721 = 278890^2 + 238189^2 .

It is an emirp because it is prime and its reverse (128136315431) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 134513631821 - 2¹⁴ = 134513615437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (134513634821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67256815910 + 67256815911.

It is an arithmetic number, because the mean of its divisors is an integer number (67256815911).

Almost surely, 2^134513631821 is an apocalyptic number.

It is an amenable number.

134513631821 is a deficient number, since it is larger than the sum of its proper divisors (1).

134513631821 is an equidigital number, since it uses as much as digits as its factorization.

134513631821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 38.

The spelling of 134513631821 in words is "one hundred thirty-four billion, five hundred thirteen million, six hundred thirty-one thousand, eight hundred twenty-one".