2159831 has 2 divisors, whose sum is σ = 2159832. Its totient is φ = 2159830.

The previous prime is 2159821. The next prime is 2159881. The reversal of 2159831 is 1389512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2159831 - 2⁶ = 2159767 is a prime.

It is a super-2 number, since 2×2159831² = 9329739897122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2159794 and 2159803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2159821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079915 + 1079916.

It is an arithmetic number, because the mean of its divisors is an integer number (1079916).

2^2159831 is an apocalyptic number.

2159831 is a deficient number, since it is larger than the sum of its proper divisors (1).

2159831 is an equidigital number, since it uses as much as digits as its factorization.

2159831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 29.

The square root of 2159831 is about 1469.6363495777. The cubic root of 2159831 is about 129.2627100227.

The spelling of 2159831 in words is "two million, one hundred fifty-nine thousand, eight hundred thirty-one".