81694119 has 8 divisors (see below), whose sum is σ = 117304432. Its totient is φ = 50273280.

The previous prime is 81694103. The next prime is 81694157. The reversal of 81694119 is 91149618.

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

It is not a de Polignac number, because 81694119 - 2⁴ = 81694103 is a prime.

It is a super-2 number, since 2×81694119² = 13347858158372322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 2094721 = 81694119 / (8 + 1 + 6 + 9 + 4 + 1 + 1 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81694159) 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, 1047322 + ... + 1047399.

It is an arithmetic number, because the mean of its divisors is an integer number (14663054).

Almost surely, 2^81694119 is an apocalyptic number.

81694119 is a deficient number, since it is larger than the sum of its proper divisors (35610313).

81694119 is a wasteful number, since it uses less digits than its factorization.

81694119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2094737.

The product of its digits is 15552, while the sum is 39.

The square root of 81694119 is about 9038.4799053823. The cubic root of 81694119 is about 433.9072745337.

The spelling of 81694119 in words is "eighty-one million, six hundred ninety-four thousand, one hundred nineteen".