161851976 has 48 divisors (see below), whose sum is σ = 358518960. Its totient is φ = 67903680.

The previous prime is 161851903. The next prime is 161851999. The reversal of 161851976 is 679158161.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9431 + ... + 20313.

It is an arithmetic number, because the mean of its divisors is an integer number (7469145).

Almost surely, 2^161851976 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161851976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179259480).

161851976 is an abundant number, since it is smaller than the sum of its proper divisors (196666984).

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

161851976 is a wasteful number, since it uses less digits than its factorization.

161851976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10926 (or 10909 counting only the distinct ones).

The product of its digits is 90720, while the sum is 44.

The square root of 161851976 is about 12722.1058005348. The cubic root of 161851976 is about 544.9700917852.

The spelling of 161851976 in words is "one hundred sixty-one million, eight hundred fifty-one thousand, nine hundred seventy-six".