2154331 has 2 divisors, whose sum is σ = 2154332. Its totient is φ = 2154330.

The previous prime is 2154329. The next prime is 2154389. The reversal of 2154331 is 1334512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2154331 - 2¹ = 2154329 is a prime.

It is a super-2 number, since 2×2154331² = 9282284115122, which contains 22 as substring.

Together with 2154329, it forms a pair of twin primes.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2154299 and 2154308.

It is not a weakly prime, because it can be changed into another prime (2154311) 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 as a sum of consecutive naturals, namely, 1077165 + 1077166.

It is an arithmetic number, because the mean of its divisors is an integer number (1077166).

2^2154331 is an apocalyptic number.

2154331 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154331 is an equidigital number, since it uses as much as digits as its factorization.

2154331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 19.

The square root of 2154331 is about 1467.7639455989. The cubic root of 2154331 is about 129.1528944502.

Adding to 2154331 its reverse (1334512), we get a palindrome (3488843).

It can be divided in two parts, 2154 and 331, that added together give a triangular number (2485 = T₇₀).

The spelling of 2154331 in words is "two million, one hundred fifty-four thousand, three hundred thirty-one".