161115481 has 2 divisors, whose sum is σ = 161115482. Its totient is φ = 161115480.

The previous prime is 161115473. The next prime is 161115517. The reversal of 161115481 is 184511161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126787600 + 34327881 = 11260^2 + 5859^2 .

It is a cyclic number.

It is not a de Polignac number, because 161115481 - 2³ = 161115473 is a prime.

It is a super-2 number, since 2×161115481² = 51916396435722722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161115181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80557740 + 80557741.

It is an arithmetic number, because the mean of its divisors is an integer number (80557741).

Almost surely, 2^161115481 is an apocalyptic number.

It is an amenable number.

161115481 is a deficient number, since it is larger than the sum of its proper divisors (1).

161115481 is an equidigital number, since it uses as much as digits as its factorization.

161115481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 28.

The square root of 161115481 is about 12693.1273136292. The cubic root of 161115481 is about 544.1422199253.

It can be divided in two parts, 161115 and 481, that added together give a triangular number (161596 = T₅₆₈).

The spelling of 161115481 in words is "one hundred sixty-one million, one hundred fifteen thousand, four hundred eighty-one".