412161821 has 4 divisors (see below), whose sum is σ = 436406652. Its totient is φ = 387916992.

The previous prime is 412161803. The next prime is 412161877. The reversal of 412161821 is 128161214.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 354568900 + 57592921 = 18830^2 + 7589^2 .

It is a cyclic number.

It is not a de Polignac number, because 412161821 - 2²² = 407967517 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 (412161121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12122390 + ... + 12122423.

It is an arithmetic number, because the mean of its divisors is an integer number (109101663).

Almost surely, 2^412161821 is an apocalyptic number.

It is an amenable number.

412161821 is a deficient number, since it is larger than the sum of its proper divisors (24244831).

412161821 is a wasteful number, since it uses less digits than its factorization.

412161821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24244830.

The product of its digits is 768, while the sum is 26.

The square root of 412161821 is about 20301.7689130775. The cubic root of 412161821 is about 744.1992934767.

The spelling of 412161821 in words is "four hundred twelve million, one hundred sixty-one thousand, eight hundred twenty-one".