81396153 has 12 divisors (see below), whose sum is σ = 124488468. Its totient is φ = 51072000.

The previous prime is 81396109. The next prime is 81396199. The reversal of 81396153 is 35169318.

It is a happy number.

81396153 is a `hidden beast` number, since 8 + 1 + 39 + 615 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 40602384 + 40793769 = 6372^2 + 6387^2 .

It is not a de Polignac number, because 81396153 - 2¹⁰ = 81395129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81397153) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 265848 + ... + 266153.

It is an arithmetic number, because the mean of its divisors is an integer number (10374039).

Almost surely, 2^81396153 is an apocalyptic number.

It is an amenable number.

81396153 is a deficient number, since it is larger than the sum of its proper divisors (43092315).

81396153 is a wasteful number, since it uses less digits than its factorization.

81396153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532024 (or 532021 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 81396153 is about 9021.9816559335. The cubic root of 81396153 is about 433.3790964818.

The spelling of 81396153 in words is "eighty-one million, three hundred ninety-six thousand, one hundred fifty-three".