161061481 has 21 divisors (see below), whose sum is σ = 193120599. Its totient is φ = 134321544.

The previous prime is 161061469. The next prime is 161061493. The reversal of 161061481 is 184160161.

The square root of 161061481 is 12691.

It is a perfect power (a square), and thus also a powerful number.

161061481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161061469) and next prime (161061493).

It can be written as a sum of positive squares in only one way, i.e., 144120025 + 16941456 = 12005^2 + 4116^2 .

It is not a de Polignac number, because 161061481 - 2⁵ = 161061449 is a prime.

It is a super-2 number, since 2×161061481² = 51881601323826722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161061421) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 4352995 + ... + 4353031.

It is an arithmetic number, because the mean of its divisors is an integer number (9196219).

Almost surely, 2^161061481 is an apocalyptic number.

161061481 is the 12691-st square number.

161061481 is the 6346-th centered octagonal number.

It is an amenable number.

161061481 is a deficient number, since it is larger than the sum of its proper divisors (32059118).

161061481 is an frugal number, since it uses more digits than its factorization.

161061481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116 (or 44 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The cubic root of 161061481 is about 544.0814209608.

The spelling of 161061481 in words is "one hundred sixty-one million, sixty-one thousand, four hundred eighty-one".