81195949 has 8 divisors (see below), whose sum is σ = 87554880. Its totient is φ = 75045600.

The previous prime is 81195923. The next prime is 81195973. The reversal of 81195949 is 94959118.

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

It is a cyclic number.

It is not a de Polignac number, because 81195949 - 2¹¹ = 81193901 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81195899 and 81195908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81195449) 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, 51337 + ... + 52894.

It is an arithmetic number, because the mean of its divisors is an integer number (10944360).

Almost surely, 2^81195949 is an apocalyptic number.

It is an amenable number.

81195949 is a deficient number, since it is larger than the sum of its proper divisors (6358931).

81195949 is a wasteful number, since it uses less digits than its factorization.

81195949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104291.

The product of its digits is 116640, while the sum is 46.

The square root of 81195949 is about 9010.8794798288. The cubic root of 81195949 is about 433.0234881039.

The spelling of 81195949 in words is "eighty-one million, one hundred ninety-five thousand, nine hundred forty-nine".