161249222 has 16 divisors (see below), whose sum is σ = 250659360. Its totient is φ = 77706048.

The previous prime is 161249213. The next prime is 161249261. The reversal of 161249222 is 222942161.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35378 + ... + 39674.

It is an arithmetic number, because the mean of its divisors is an integer number (15666210).

Almost surely, 2^161249222 is an apocalyptic number.

161249222 is a deficient number, since it is larger than the sum of its proper divisors (89410138).

161249222 is a wasteful number, since it uses less digits than its factorization.

161249222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4975.

The product of its digits is 3456, while the sum is 29.

The square root of 161249222 is about 12698.3944654433. The cubic root of 161249222 is about 544.2927413547.

The spelling of 161249222 in words is "one hundred sixty-one million, two hundred forty-nine thousand, two hundred twenty-two".