1949581 has 2 divisors, whose sum is σ = 1949582. Its totient is φ = 1949580.

The previous prime is 1949579. The next prime is 1949627. The reversal of 1949581 is 1859491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1121481 + 828100 = 1059^2 + 910^2 .

It is an emirp because it is prime and its reverse (1859491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1949581 - 2¹ = 1949579 is a prime.

It is a super-2 number, since 2×1949581² = 7601732151122, which contains 22 as substring.

Together with 1949579, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1949581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1949501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 974790 + 974791.

It is an arithmetic number, because the mean of its divisors is an integer number (974791).

2^1949581 is an apocalyptic number.

It is an amenable number.

1949581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1949581 is an equidigital number, since it uses as much as digits as its factorization.

1949581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 37.

The square root of 1949581 is about 1396.2739702508. The cubic root of 1949581 is about 124.9243488912.

The spelling of 1949581 in words is "one million, nine hundred forty-nine thousand, five hundred eighty-one".