161121364 has 12 divisors (see below), whose sum is σ = 283174164. Its totient is φ = 80214464.

The previous prime is 161121329. The next prime is 161121377. The reversal of 161121364 is 463121161.

It can be written as a sum of positive squares in 2 ways, for example, as 29789764 + 131331600 = 5458^2 + 11460^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85507 + ... + 87370.

It is an arithmetic number, because the mean of its divisors is an integer number (23597847).

Almost surely, 2^161121364 is an apocalyptic number.

It is an amenable number.

161121364 is a deficient number, since it is larger than the sum of its proper divisors (122052800).

161121364 is a wasteful number, since it uses less digits than its factorization.

161121364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173114 (or 173112 counting only the distinct ones).

The product of its digits is 864, while the sum is 25.

The square root of 161121364 is about 12693.3590510944. The cubic root of 161121364 is about 544.1488428141.

The spelling of 161121364 in words is "one hundred sixty-one million, one hundred twenty-one thousand, three hundred sixty-four".