161162215531 has 2 divisors, whose sum is σ = 161162215532. Its totient is φ = 161162215530.

The previous prime is 161162215519. The next prime is 161162215547. The reversal of 161162215531 is 135512261161.

It is a weak prime.

It is an emirp because it is prime and its reverse (135512261161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161162215531 - 2¹¹ = 161162213483 is a prime.

It is a super-2 number, since 2×161162215531² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161162215031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80581107765 + 80581107766.

It is an arithmetic number, because the mean of its divisors is an integer number (80581107766).

Almost surely, 2^161162215531 is an apocalyptic number.

161162215531 is a deficient number, since it is larger than the sum of its proper divisors (1).

161162215531 is an equidigital number, since it uses as much as digits as its factorization.

161162215531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 34.

Adding to 161162215531 its reverse (135512261161), we get a palindrome (296674476692).

The spelling of 161162215531 in words is "one hundred sixty-one billion, one hundred sixty-two million, two hundred fifteen thousand, five hundred thirty-one".