1981495 has 4 divisors (see below), whose sum is σ = 2377800. Its totient is φ = 1585192.

The previous prime is 1981493. The next prime is 1981513. The reversal of 1981495 is 5941891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1981495 - 2¹ = 1981493 is a prime.

It is a super-3 number, since 3×1981495³ = 23339964820169587125, which contains 333 as substring.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981493) 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 3 ways as a sum of consecutive naturals, for example, 198145 + ... + 198154.

It is an arithmetic number, because the mean of its divisors is an integer number (594450).

2^1981495 is an apocalyptic number.

1981495 is a deficient number, since it is larger than the sum of its proper divisors (396305).

1981495 is an equidigital number, since it uses as much as digits as its factorization.

1981495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396304.

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

The square root of 1981495 is about 1407.6558528277. The cubic root of 1981495 is about 125.6023196929.

The spelling of 1981495 in words is "one million, nine hundred eighty-one thousand, four hundred ninety-five".