81195837 has 8 divisors (see below), whose sum is σ = 110564736. Its totient is φ = 52978752.

The previous prime is 81195833. The next prime is 81195839. The reversal of 81195837 is 73859118.

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

It is not a de Polignac number, because 81195837 - 2² = 81195833 is a prime.

It is a super-2 number, since 2×81195837² = 13185527892261138, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81195833) 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, 287788 + ... + 288069.

It is an arithmetic number, because the mean of its divisors is an integer number (13820592).

Almost surely, 2^81195837 is an apocalyptic number.

It is an amenable number.

81195837 is a deficient number, since it is larger than the sum of its proper divisors (29368899).

81195837 is a wasteful number, since it uses less digits than its factorization.

81195837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575907.

The product of its digits is 60480, while the sum is 42.

The square root of 81195837 is about 9010.8732651170. The cubic root of 81195837 is about 433.0232890026.

The spelling of 81195837 in words is "eighty-one million, one hundred ninety-five thousand, eight hundred thirty-seven".