161570444 has 18 divisors (see below), whose sum is σ = 328911660. Its totient is φ = 69244392.

The previous prime is 161570441. The next prime is 161570449. The reversal of 161570444 is 444075161.

It is a super-2 number, since 2×161570444² = 52210016748714272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161570444.

It is not an unprimeable number, because it can be changed into a prime (161570441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 411974 + ... + 412365.

It is an arithmetic number, because the mean of its divisors is an integer number (18272870).

Almost surely, 2^161570444 is an apocalyptic number.

161570444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

161570444 is an abundant number, since it is smaller than the sum of its proper divisors (167341216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161570444 is a wasteful number, since it uses less digits than its factorization.

161570444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824357 (or 824348 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 161570444 is about 12711.0363070837. The cubic root of 161570444 is about 544.6539272491.

The spelling of 161570444 in words is "one hundred sixty-one million, five hundred seventy thousand, four hundred forty-four".