161564061 has 8 divisors (see below), whose sum is σ = 215633824. Its totient is φ = 107601840.

The previous prime is 161564059. The next prime is 161564063. The reversal of 161564061 is 160465161.

It is an interprime number because it is at equal distance from previous prime (161564059) and next prime (161564063).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161564061 - 2¹ = 161564059 is a prime.

It is a super-2 number, since 2×161564061² = 52205891613623442, 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 (161564063) 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 7 ways as a sum of consecutive naturals, for example, 23311 + ... + 29436.

It is an arithmetic number, because the mean of its divisors is an integer number (26954228).

Almost surely, 2^161564061 is an apocalyptic number.

It is an amenable number.

161564061 is a deficient number, since it is larger than the sum of its proper divisors (54069763).

161564061 is a wasteful number, since it uses less digits than its factorization.

161564061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53771.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 161564061 is about 12710.7852235808. The cubic root of 161564061 is about 544.6467547908.

The spelling of 161564061 in words is "one hundred sixty-one million, five hundred sixty-four thousand, sixty-one".