2147381 has 2 divisors, whose sum is σ = 2147382. Its totient is φ = 2147380.

The previous prime is 2147359. The next prime is 2147407. The reversal of 2147381 is 1837412.

It is an a-pointer prime, because the next prime (2147407) can be obtained adding 2147381 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2146225 + 1156 = 1465^2 + 34^2 .

It is a cyclic number.

It is not a de Polignac number, because 2147381 - 2¹⁰ = 2146357 is a prime.

It is a super-2 number, since 2×2147381² = 9222490318322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2147381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2147351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1073690 + 1073691.

It is an arithmetic number, because the mean of its divisors is an integer number (1073691).

2^2147381 is an apocalyptic number.

It is an amenable number.

2147381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2147381 is an equidigital number, since it uses as much as digits as its factorization.

2147381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 26.

The square root of 2147381 is about 1465.3944861368. The cubic root of 2147381 is about 129.0138598573.

The spelling of 2147381 in words is "two million, one hundred forty-seven thousand, three hundred eighty-one".