81153438 has 16 divisors (see below), whose sum is σ = 165058560. Its totient is φ = 26592536.

The previous prime is 81153437. The next prime is 81153439. The reversal of 81153438 is 83435118.

It is an interprime number because it is at equal distance from previous prime (81153437) and next prime (81153439).

It is a junction number, because it is equal to n+sod(n) for n = 81153399 and 81153408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81153431) 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, 114270 + ... + 114977.

It is an arithmetic number, because the mean of its divisors is an integer number (10316160).

Almost surely, 2^81153438 is an apocalyptic number.

81153438 is an abundant number, since it is smaller than the sum of its proper divisors (83905122).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81153438 is a wasteful number, since it uses less digits than its factorization.

81153438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229311.

The product of its digits is 11520, while the sum is 33.

The square root of 81153438 is about 9008.5203002491. The cubic root of 81153438 is about 432.9479035652.

The spelling of 81153438 in words is "eighty-one million, one hundred fifty-three thousand, four hundred thirty-eight".