161572422 has 16 divisors (see below), whose sum is σ = 352521792. Its totient is φ = 48961320.

The previous prime is 161572421. The next prime is 161572441. The reversal of 161572422 is 224275161.

It is a super-2 number, since 2×161572422² = 52211295101892168, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161572422.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161572421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1223968 + ... + 1224099.

It is an arithmetic number, because the mean of its divisors is an integer number (22032612).

Almost surely, 2^161572422 is an apocalyptic number.

161572422 is an abundant number, since it is smaller than the sum of its proper divisors (190949370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161572422 is a wasteful number, since it uses less digits than its factorization.

161572422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2448083.

The product of its digits is 6720, while the sum is 30.

The square root of 161572422 is about 12711.1141132475. The cubic root of 161572422 is about 544.6561498525.

The spelling of 161572422 in words is "one hundred sixty-one million, five hundred seventy-two thousand, four hundred twenty-two".