81029494 has 32 divisors (see below), whose sum is σ = 150716160. Its totient is φ = 31815072.

The previous prime is 81029491. The next prime is 81029513. The reversal of 81029494 is 49492018.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81029491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23697 + ... + 26899.

It is an arithmetic number, because the mean of its divisors is an integer number (4709880).

Almost surely, 2^81029494 is an apocalyptic number.

81029494 is a deficient number, since it is larger than the sum of its proper divisors (69686666).

81029494 is a wasteful number, since it uses less digits than its factorization.

81029494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3364.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 81029494 is about 9001.6384064236. The cubic root of 81029494 is about 432.7273804094.

The spelling of 81029494 in words is "eighty-one million, twenty-nine thousand, four hundred ninety-four".