81192152 has 8 divisors (see below), whose sum is σ = 152235300. Its totient is φ = 40596072.

The previous prime is 81192151. The next prime is 81192157. The reversal of 81192152 is 25129118.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×81192152² = 13184331092782208, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81192151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5074502 + ... + 5074517.

Almost surely, 2^81192152 is an apocalyptic number.

It is an amenable number.

81192152 is a deficient number, since it is larger than the sum of its proper divisors (71043148).

81192152 is a wasteful number, since it uses less digits than its factorization.

81192152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10149025 (or 10149021 counting only the distinct ones).

The product of its digits is 1440, while the sum is 29.

The square root of 81192152 is about 9010.6687876095. The cubic root of 81192152 is about 433.0167381127.

The spelling of 81192152 in words is "eighty-one million, one hundred ninety-two thousand, one hundred fifty-two".