161294821 has 8 divisors (see below), whose sum is σ = 163409400. Its totient is φ = 159192000.

The previous prime is 161294773. The next prime is 161294851. The reversal of 161294821 is 128492161.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 44957025 + 116337796 = 6705^2 + 10786^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161294821 - 2¹¹ = 161292773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161294851) 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, 26571 + ... + 32071.

It is an arithmetic number, because the mean of its divisors is an integer number (20426175).

Almost surely, 2^161294821 is an apocalyptic number.

It is an amenable number.

161294821 is a deficient number, since it is larger than the sum of its proper divisors (2114579).

161294821 is a wasteful number, since it uses less digits than its factorization.

161294821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5879.

The product of its digits is 6912, while the sum is 34.

The square root of 161294821 is about 12700.1898017313. The cubic root of 161294821 is about 544.3440426163.

The spelling of 161294821 in words is "one hundred sixty-one million, two hundred ninety-four thousand, eight hundred twenty-one".