161883787 has 8 divisors (see below), whose sum is σ = 177292080. Its totient is φ = 146897760.

The previous prime is 161883779. The next prime is 161883793. The reversal of 161883787 is 787388161.

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

It is a cyclic number.

It is not a de Polignac number, because 161883787 - 2³ = 161883779 is a prime.

It is a super-2 number, since 2×161883787² = 52412720986922738, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161883787.

It is not an unprimeable number, because it can be changed into a prime (161883727) 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, 104764 + ... + 106297.

It is an arithmetic number, because the mean of its divisors is an integer number (22161510).

Almost surely, 2^161883787 is an apocalyptic number.

161883787 is a deficient number, since it is larger than the sum of its proper divisors (15408293).

161883787 is a wasteful number, since it uses less digits than its factorization.

161883787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211133.

The product of its digits is 451584, while the sum is 49.

The square root of 161883787 is about 12723.3559645245. The cubic root of 161883787 is about 545.0057929413.

The spelling of 161883787 in words is "one hundred sixty-one million, eight hundred eighty-three thousand, seven hundred eighty-seven".