161507222 has 8 divisors (see below), whose sum is σ = 242814000. Its totient is φ = 80569224.

The previous prime is 161507197. The next prime is 161507237. The reversal of 161507222 is 222705161.

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

It is a super-3 number, since 3×161507222³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161507191 and 161507200.

It is a congruent number.

It is an unprimeable number.

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, 91097 + ... + 92852.

It is an arithmetic number, because the mean of its divisors is an integer number (30351750).

Almost surely, 2^161507222 is an apocalyptic number.

161507222 is a deficient number, since it is larger than the sum of its proper divisors (81306778).

161507222 is a wasteful number, since it uses less digits than its factorization.

161507222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184390.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 161507222 is about 12708.5491697518. The cubic root of 161507222 is about 544.5828775322.

The spelling of 161507222 in words is "one hundred sixty-one million, five hundred seven thousand, two hundred twenty-two".