1155122215531 has 2 divisors, whose sum is σ = 1155122215532. Its totient is φ = 1155122215530.

The previous prime is 1155122215477. The next prime is 1155122215579. The reversal of 1155122215531 is 1355122215511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1155122215531 - 2¹³ = 1155122207339 is a prime.

It is a super-2 number, since 2×1155122215531² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1155122215231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577561107765 + 577561107766.

It is an arithmetic number, because the mean of its divisors is an integer number (577561107766).

Almost surely, 2^{1155122215531} is an apocalyptic number.

1155122215531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155122215531 is an equidigital number, since it uses as much as digits as its factorization.

1155122215531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15000, while the sum is 34.

The spelling of 1155122215531 in words is "one trillion, one hundred fifty-five billion, one hundred twenty-two million, two hundred fifteen thousand, five hundred thirty-one".