81299337 has 8 divisors (see below), whose sum is σ = 123884736. Its totient is φ = 46456752.

The previous prime is 81299327. The next prime is 81299353. The reversal of 81299337 is 73399218.

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

It is not a de Polignac number, because 81299337 - 2¹⁰ = 81298313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81299327) 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, 1935678 + ... + 1935719.

It is an arithmetic number, because the mean of its divisors is an integer number (15485592).

Almost surely, 2^81299337 is an apocalyptic number.

It is an amenable number.

81299337 is a deficient number, since it is larger than the sum of its proper divisors (42585399).

81299337 is a wasteful number, since it uses less digits than its factorization.

81299337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3871407.

The product of its digits is 81648, while the sum is 42.

The square root of 81299337 is about 9016.6144976926. The cubic root of 81299337 is about 433.2072018832.

The spelling of 81299337 in words is "eighty-one million, two hundred ninety-nine thousand, three hundred thirty-seven".