161020544 has 16 divisors (see below), whose sum is σ = 320783370. Its totient is φ = 80510208.

The previous prime is 161020537. The next prime is 161020589. The reversal of 161020544 is 445020161.

It can be written as a sum of positive squares in only one way, i.e., 160782400 + 238144 = 12680^2 + 488^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628859 + ... + 629114.

Almost surely, 2^161020544 is an apocalyptic number.

It is an amenable number.

161020544 is a deficient number, since it is larger than the sum of its proper divisors (159762826).

161020544 is an equidigital number, since it uses as much as digits as its factorization.

161020544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1257987 (or 1257975 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 161020544 is about 12689.3870616354. The cubic root of 161020544 is about 544.0353206594.

The spelling of 161020544 in words is "one hundred sixty-one million, twenty thousand, five hundred forty-four".