161788047 has 4 divisors (see below), whose sum is σ = 215717400. Its totient is φ = 107858696.

The previous prime is 161788037. The next prime is 161788057. The reversal of 161788047 is 740887161.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (161788037) and next prime (161788057).

It is a cyclic number.

It is not a de Polignac number, because 161788047 - 2⁷ = 161787919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161788007) 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 3 ways as a sum of consecutive naturals, for example, 26964672 + ... + 26964677.

It is an arithmetic number, because the mean of its divisors is an integer number (53929350).

Almost surely, 2^161788047 is an apocalyptic number.

161788047 is a deficient number, since it is larger than the sum of its proper divisors (53929353).

161788047 is an equidigital number, since it uses as much as digits as its factorization.

161788047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53929352.

The product of its (nonzero) digits is 75264, while the sum is 42.

The square root of 161788047 is about 12719.5930359426. The cubic root of 161788047 is about 544.8983307810.

The spelling of 161788047 in words is "one hundred sixty-one million, seven hundred eighty-eight thousand, forty-seven".