161491064 has 24 divisors (see below), whose sum is σ = 352232640. Its totient is φ = 69210288.

The previous prime is 161491063. The next prime is 161491067. The reversal of 161491064 is 460194161.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 161491064.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161491063) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 205592 + ... + 206375.

It is an arithmetic number, because the mean of its divisors is an integer number (14676360).

Almost surely, 2^161491064 is an apocalyptic number.

161491064 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

161491064 is an abundant number, since it is smaller than the sum of its proper divisors (190741576).

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

161491064 is a wasteful number, since it uses less digits than its factorization.

161491064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411987 (or 411976 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 161491064 is about 12707.9134400577. The cubic root of 161491064 is about 544.5647159840.

The spelling of 161491064 in words is "one hundred sixty-one million, four hundred ninety-one thousand, sixty-four".