2381691 has 16 divisors (see below), whose sum is σ = 3449376. Its totient is φ = 1453056.

The previous prime is 2381689. The next prime is 2381693. The reversal of 2381691 is 1961832.

It is an interprime number because it is at equal distance from previous prime (2381689) and next prime (2381693).

It is not a de Polignac number, because 2381691 - 2¹ = 2381689 is a prime.

It is an Ulam number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (2381693) 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 15 ways as a sum of consecutive naturals, for example, 6571 + ... + 6923.

It is an arithmetic number, because the mean of its divisors is an integer number (215586).

2^2381691 is an apocalyptic number.

2381691 is a deficient number, since it is larger than the sum of its proper divisors (1067685).

2381691 is a wasteful number, since it uses less digits than its factorization.

2381691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542.

The product of its digits is 2592, while the sum is 30.

The square root of 2381691 is about 1543.2728209879. The cubic root of 2381691 is about 133.5452581196.

The spelling of 2381691 in words is "two million, three hundred eighty-one thousand, six hundred ninety-one".