161651274 has 32 divisors (see below), whose sum is σ = 332095680. Its totient is φ = 52425600.

The previous prime is 161651263. The next prime is 161651293. The reversal of 161651274 is 472156161.

161651274 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161651274² = 52262268771646152, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124569 + ... + 125859.

It is an arithmetic number, because the mean of its divisors is an integer number (10377990).

Almost surely, 2^161651274 is an apocalyptic number.

161651274 is an abundant number, since it is smaller than the sum of its proper divisors (170444406).

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

161651274 is a wasteful number, since it uses less digits than its factorization.

161651274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1846.

The product of its digits is 10080, while the sum is 33.

The square root of 161651274 is about 12714.2154299823. The cubic root of 161651274 is about 544.7447380773.

The spelling of 161651274 in words is "one hundred sixty-one million, six hundred fifty-one thousand, two hundred seventy-four".