2161631023 has 8 divisors (see below), whose sum is σ = 2273463936. Its totient is φ = 2052429600.

The previous prime is 2161631009. The next prime is 2161631033. The reversal of 2161631023 is 3201361612.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2161631023 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 (2161631033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 656188 + ... + 659473.

It is an arithmetic number, because the mean of its divisors is an integer number (284182992).

Almost surely, 2^2161631023 is an apocalyptic number.

2161631023 is a deficient number, since it is larger than the sum of its proper divisors (111832913).

2161631023 is a wasteful number, since it uses less digits than its factorization.

2161631023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1315745.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 2161631023 is about 46493.3438569437. The cubic root of 2161631023 is about 1292.9860962822.

Adding to 2161631023 its reverse (3201361612), we get a palindrome (5362992635).

The spelling of 2161631023 in words is "two billion, one hundred sixty-one million, six hundred thirty-one thousand, twenty-three".