161567549 has 18 divisors (see below), whose sum is σ = 192326778. Its totient is φ = 135564000.

The previous prime is 161567537. The next prime is 161567557. The reversal of 161567549 is 945765161.

161567549 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 1545049 + 160022500 = 1243^2 + 12650^2 .

It is not a de Polignac number, because 161567549 - 2⁴ = 161567533 is a prime.

It is a super-2 number, since 2×161567549² = 52208145779734802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161567509) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 16499 + ... + 24399.

It is an arithmetic number, because the mean of its divisors is an integer number (10684821).

Almost surely, 2^161567549 is an apocalyptic number.

It is an amenable number.

161567549 is a deficient number, since it is larger than the sum of its proper divisors (30759229).

161567549 is a wasteful number, since it uses less digits than its factorization.

161567549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7949 (or 7925 counting only the distinct ones).

The product of its digits is 226800, while the sum is 44.

The square root of 161567549 is about 12710.9224291552. The cubic root of 161567549 is about 544.6506742149.

The spelling of 161567549 in words is "one hundred sixty-one million, five hundred sixty-seven thousand, five hundred forty-nine".