81654315 has 16 divisors (see below), whose sum is σ = 138332448. Its totient is φ = 40987136.

The previous prime is 81654271. The next prime is 81654317. The reversal of 81654315 is 51345618.

It is not a de Polignac number, because 81654315 - 2⁷ = 81654187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81654317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159852 + ... + 160361.

It is an arithmetic number, because the mean of its divisors is an integer number (8645778).

Almost surely, 2^81654315 is an apocalyptic number.

81654315 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

81654315 is a deficient number, since it is larger than the sum of its proper divisors (56678133).

81654315 is a wasteful number, since it uses less digits than its factorization.

81654315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320238.

The product of its digits is 14400, while the sum is 33.

The square root of 81654315 is about 9036.2777181758. The cubic root of 81654315 is about 433.8367918961.

The spelling of 81654315 in words is "eighty-one million, six hundred fifty-four thousand, three hundred fifteen".