161322774 has 16 divisors (see below), whose sum is σ = 322846320. Its totient is φ = 53740800.

The previous prime is 161322769. The next prime is 161322779. The reversal of 161322774 is 477223161.

It is an interprime number because it is at equal distance from previous prime (161322769) and next prime (161322779).

It is a super-2 number, since 2×161322774² = 52050074822110152, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161322779) 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, 3342 + ... + 18270.

It is an arithmetic number, because the mean of its divisors is an integer number (20177895).

Almost surely, 2^161322774 is an apocalyptic number.

161322774 is an abundant number, since it is smaller than the sum of its proper divisors (161523546).

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

161322774 is a wasteful number, since it uses less digits than its factorization.

161322774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16735.

The product of its digits is 14112, while the sum is 33.

The square root of 161322774 is about 12701.2902494195. The cubic root of 161322774 is about 544.3754864242.

The spelling of 161322774 in words is "one hundred sixty-one million, three hundred twenty-two thousand, seven hundred seventy-four".