161547700 has 18 divisors (see below), whose sum is σ = 350558726. Its totient is φ = 64619040.

The previous prime is 161547697. The next prime is 161547721. The reversal of 161547700 is 7745161.

161547700 is digitally balanced in base 3, 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 57426084 + 104121616 = 7578^2 + 10204^2 .

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 5 ways as a sum of consecutive naturals, for example, 807639 + ... + 807838.

Almost surely, 2^161547700 is an apocalyptic number.

161547700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161547700 is an abundant number, since it is smaller than the sum of its proper divisors (189011026).

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

161547700 is a wasteful number, since it uses less digits than its factorization.

161547700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1615491 (or 1615484 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 161547700 is about 12710.1416199821. The cubic root of 161547700 is about 544.6283693770.

The spelling of 161547700 in words is "one hundred sixty-one million, five hundred forty-seven thousand, seven hundred".