81737313 has 16 divisors (see below), whose sum is σ = 127591296. Its totient is φ = 45567360.

The previous prime is 81737311. The next prime is 81737317. The reversal of 81737313 is 31373718.

It is not a de Polignac number, because 81737313 - 2¹ = 81737311 is a prime.

It is a super-3 number, since 3×81737313³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (81737311) 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, 46606 + ... + 48327.

It is an arithmetic number, because the mean of its divisors is an integer number (7974456).

Almost surely, 2^81737313 is an apocalyptic number.

It is an amenable number.

81737313 is a deficient number, since it is larger than the sum of its proper divisors (45853983).

81737313 is a wasteful number, since it uses less digits than its factorization.

81737313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94984.

The product of its digits is 10584, while the sum is 33.

The square root of 81737313 is about 9040.8690400868. The cubic root of 81737313 is about 433.9837340913.

The spelling of 81737313 in words is "eighty-one million, seven hundred thirty-seven thousand, three hundred thirteen".