81650429 has 16 divisors (see below), whose sum is σ = 99254400. Its totient is φ = 65608704.

The previous prime is 81650411. The next prime is 81650431. The reversal of 81650429 is 92405618.

81650429 = 378² + 379² + ... + 668².

It is not a de Polignac number, because 81650429 - 2¹² = 81646333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81650489) 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, 9737 + ... + 16065.

It is an arithmetic number, because the mean of its divisors is an integer number (6203400).

Almost surely, 2^81650429 is an apocalyptic number.

It is an amenable number.

81650429 is a deficient number, since it is larger than the sum of its proper divisors (17603971).

81650429 is a wasteful number, since it uses less digits than its factorization.

81650429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6452.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 81650429 is about 9036.0626934523. The cubic root of 81650429 is about 433.8299095632.

The spelling of 81650429 in words is "eighty-one million, six hundred fifty thousand, four hundred twenty-nine".