161257422 has 16 divisors (see below), whose sum is σ = 322947792. Its totient is φ = 53680320.

The previous prime is 161257417. The next prime is 161257451. The reversal of 161257422 is 224752161.

It is a self number, because there is not a number n which added to its sum of digits gives 161257422.

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, 13093 + ... + 22224.

It is an arithmetic number, because the mean of its divisors is an integer number (20184237).

Almost surely, 2^161257422 is an apocalyptic number.

161257422 is an abundant number, since it is smaller than the sum of its proper divisors (161690370).

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

161257422 is a wasteful number, since it uses less digits than its factorization.

161257422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36083.

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

The square root of 161257422 is about 12698.7173368022. The cubic root of 161257422 is about 544.3019674970.

The spelling of 161257422 in words is "one hundred sixty-one million, two hundred fifty-seven thousand, four hundred twenty-two".