81119629 has 4 divisors (see below), whose sum is σ = 83006176. Its totient is φ = 79233084.

The previous prime is 81119611. The next prime is 81119659. The reversal of 81119629 is 92691118.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81119629 - 2⁷ = 81119501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81119609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 943209 + ... + 943294.

It is an arithmetic number, because the mean of its divisors is an integer number (20751544).

Almost surely, 2^81119629 is an apocalyptic number.

It is an amenable number.

81119629 is a deficient number, since it is larger than the sum of its proper divisors (1886547).

81119629 is a wasteful number, since it uses less digits than its factorization.

81119629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1886546.

The product of its digits is 7776, while the sum is 37.

The square root of 81119629 is about 9006.6436034740. The cubic root of 81119629 is about 432.8877723323.

The spelling of 81119629 in words is "eighty-one million, one hundred nineteen thousand, six hundred twenty-nine".