81982419 has 8 divisors (see below), whose sum is σ = 114062592. Its totient is φ = 52278600.

The previous prime is 81982403. The next prime is 81982427. The reversal of 81982419 is 91428918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81982419 - 2⁴ = 81982403 is a prime.

It is a super-2 number, since 2×81982419² = 13442234050183122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81982499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 594007 + ... + 594144.

It is an arithmetic number, because the mean of its divisors is an integer number (14257824).

Almost surely, 2^81982419 is an apocalyptic number.

81982419 is a deficient number, since it is larger than the sum of its proper divisors (32080173).

81982419 is a wasteful number, since it uses less digits than its factorization.

81982419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1188177.

The product of its digits is 41472, while the sum is 42.

The square root of 81982419 is about 9054.4143377692. The cubic root of 81982419 is about 434.4170974434.

It can be divided in two parts, 819 and 82419, that added together give a palindrome (83238).

The spelling of 81982419 in words is "eighty-one million, nine hundred eighty-two thousand, four hundred nineteen".