1213153557571 has 2 divisors, whose sum is σ = 1213153557572. Its totient is φ = 1213153557570.

The previous prime is 1213153557569. The next prime is 1213153557611. The reversal of 1213153557571 is 1757553513121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1213153557571 - 2¹ = 1213153557569 is a prime.

It is a super-2 number, since 2×1213153557571² (a number of 25 digits) contains 22 as substring.

Together with 1213153557569, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1213153557271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606576778785 + 606576778786.

It is an arithmetic number, because the mean of its divisors is an integer number (606576778786).

Almost surely, 2^{1213153557571} is an apocalyptic number.

1213153557571 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213153557571 is an equidigital number, since it uses as much as digits as its factorization.

1213153557571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 551250, while the sum is 46.

The spelling of 1213153557571 in words is "one trillion, two hundred thirteen billion, one hundred fifty-three million, five hundred fifty-seven thousand, five hundred seventy-one".