4020031205161 has 4 divisors (see below), whose sum is σ = 4256503629012. Its totient is φ = 3783558781312.

The previous prime is 4020031205137. The next prime is 4020031205167. The reversal of 4020031205161 is 1615021300204.

It is a happy number.

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 1361889000000 + 2658142205161 = 1167000^2 + 1630381^2 .

It is a cyclic number.

It is not a de Polignac number, because 4020031205161 - 2²¹ = 4020029108009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4020031205167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118236211900 + ... + 118236211933.

It is an arithmetic number, because the mean of its divisors is an integer number (1064125907253).

Almost surely, 2^{4020031205161} is an apocalyptic number.

It is an amenable number.

4020031205161 is a deficient number, since it is larger than the sum of its proper divisors (236472423851).

4020031205161 is a wasteful number, since it uses less digits than its factorization.

4020031205161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236472423850.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 4020031205161 its reverse (1615021300204), we get a palindrome (5635052505365).

The spelling of 4020031205161 in words is "four trillion, twenty billion, thirty-one million, two hundred five thousand, one hundred sixty-one".