161129075531 has 2 divisors, whose sum is σ = 161129075532. Its totient is φ = 161129075530.

The previous prime is 161129075519. The next prime is 161129075537. The reversal of 161129075531 is 135570921161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161129075531 - 2⁶ = 161129075467 is a prime.

It is a super-2 number, since 2×161129075531² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161129075537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80564537765 + 80564537766.

It is an arithmetic number, because the mean of its divisors is an integer number (80564537766).

Almost surely, 2^161129075531 is an apocalyptic number.

161129075531 is a deficient number, since it is larger than the sum of its proper divisors (1).

161129075531 is an equidigital number, since it uses as much as digits as its factorization.

161129075531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56700, while the sum is 41.

Adding to 161129075531 its reverse (135570921161), we get a palindrome (296699996692).

The spelling of 161129075531 in words is "one hundred sixty-one billion, one hundred twenty-nine million, seventy-five thousand, five hundred thirty-one".