81029119 has 2 divisors, whose sum is σ = 81029120. Its totient is φ = 81029118.

The previous prime is 81029111. The next prime is 81029141. The reversal of 81029119 is 91192018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81029119 - 2³ = 81029111 is a prime.

It is a super-2 number, since 2×81029119² = 13131436251832322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81029111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40514559 + 40514560.

It is an arithmetic number, because the mean of its divisors is an integer number (40514560).

Almost surely, 2^81029119 is an apocalyptic number.

81029119 is a deficient number, since it is larger than the sum of its proper divisors (1).

81029119 is an equidigital number, since it uses as much as digits as its factorization.

81029119 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 81029119 is about 9001.6175768581. The cubic root of 81029119 is about 432.7267128622.

It can be divided in two parts, 810 and 29119, that added together give a square (29929 = 173²).

The spelling of 81029119 in words is "eighty-one million, twenty-nine thousand, one hundred nineteen".