81196737 has 4 divisors (see below), whose sum is σ = 108262320. Its totient is φ = 54131156.

The previous prime is 81196721. The next prime is 81196793. The reversal of 81196737 is 73769118.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81196737 - 2⁴ = 81196721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81196237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13532787 + ... + 13532792.

It is an arithmetic number, because the mean of its divisors is an integer number (27065580).

Almost surely, 2^81196737 is an apocalyptic number.

It is an amenable number.

81196737 is a deficient number, since it is larger than the sum of its proper divisors (27065583).

81196737 is a wasteful number, since it uses less digits than its factorization.

81196737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27065582.

The product of its digits is 63504, while the sum is 42.

The square root of 81196737 is about 9010.9232046445. The cubic root of 81196737 is about 433.0248889185.

The spelling of 81196737 in words is "eighty-one million, one hundred ninety-six thousand, seven hundred thirty-seven".