81307195 has 16 divisors (see below), whose sum is σ = 101122560. Its totient is φ = 62715744.

The previous prime is 81307169. The next prime is 81307199. The reversal of 81307195 is 59170318.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 81307195 - 2⁹ = 81306683 is a prime.

It is a super-2 number, since 2×81307195² = 13221719917536050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81307195.

It is not an unprimeable number, because it can be changed into a prime (81307199) 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, 14592 + ... + 19378.

It is an arithmetic number, because the mean of its divisors is an integer number (6320160).

Almost surely, 2^81307195 is an apocalyptic number.

81307195 is a deficient number, since it is larger than the sum of its proper divisors (19815365).

81307195 is a wasteful number, since it uses less digits than its factorization.

81307195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4914.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 81307195 is about 9017.0502382986. The cubic root of 81307195 is about 433.2211586699.

The spelling of 81307195 in words is "eighty-one million, three hundred seven thousand, one hundred ninety-five".