81195023 has 8 divisors (see below), whose sum is σ = 99932448. Its totient is φ = 64242144.

The previous prime is 81195007. The next prime is 81195031. The reversal of 81195023 is 32059118.

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 81195023 - 2⁴ = 81195007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81195073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 446036 + ... + 446217.

It is an arithmetic number, because the mean of its divisors is an integer number (12491556).

Almost surely, 2^81195023 is an apocalyptic number.

81195023 is a deficient number, since it is larger than the sum of its proper divisors (18737425).

81195023 is a wasteful number, since it uses less digits than its factorization.

81195023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892273.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 81195023 is about 9010.8280973504. The cubic root of 81195023 is about 433.0218419574.

The spelling of 81195023 in words is "eighty-one million, one hundred ninety-five thousand, twenty-three".