81901307 has 8 divisors (see below), whose sum is σ = 86529600. Its totient is φ = 77393344.

The previous prime is 81901301. The next prime is 81901319. The reversal of 81901307 is 70310918.

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

It is not a de Polignac number, because 81901307 - 2⁶ = 81901243 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81901307.

It is not an unprimeable number, because it can be changed into a prime (81901301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28682 + ... + 31407.

It is an arithmetic number, because the mean of its divisors is an integer number (10816200).

Almost surely, 2^81901307 is an apocalyptic number.

81901307 is a deficient number, since it is larger than the sum of its proper divisors (4628293).

81901307 is a wasteful number, since it uses less digits than its factorization.

81901307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60165.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 81901307 is about 9049.9340881578. The cubic root of 81901307 is about 434.2737818919.

The spelling of 81901307 in words is "eighty-one million, nine hundred one thousand, three hundred seven".