161022851 has 16 divisors (see below), whose sum is σ = 180092160. Its totient is φ = 142727520.

The previous prime is 161022847. The next prime is 161022863. The reversal of 161022851 is 158220161.

It is a cyclic number.

It is not a de Polignac number, because 161022851 - 2² = 161022847 is a prime.

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 161022851.

It is not an unprimeable number, because it can be changed into a prime (161022821) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 103586 + ... + 105128.

It is an arithmetic number, because the mean of its divisors is an integer number (11255760).

Almost surely, 2^161022851 is an apocalyptic number.

161022851 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161022851 is a deficient number, since it is larger than the sum of its proper divisors (19069309).

161022851 is a wasteful number, since it uses less digits than its factorization.

161022851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1786.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 161022851 is about 12689.4779640456. The cubic root of 161022851 is about 544.0379188444.

The spelling of 161022851 in words is "one hundred sixty-one million, twenty-two thousand, eight hundred fifty-one".