81153430 has 16 divisors (see below), whose sum is σ = 152427744. Its totient is φ = 31049920.

The previous prime is 81153419. The next prime is 81153431. The reversal of 81153430 is 3435118.

It is a junction number, because it is equal to n+sod(n) for n = 81153395 and 81153404.

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, 176191 + ... + 176650.

It is an arithmetic number, because the mean of its divisors is an integer number (9526734).

Almost surely, 2^81153430 is an apocalyptic number.

81153430 is a deficient number, since it is larger than the sum of its proper divisors (71274314).

81153430 is a wasteful number, since it uses less digits than its factorization.

81153430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352871.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 81153430 is about 9008.5198562250. The cubic root of 81153430 is about 432.9478893387.

Adding to 81153430 its reverse (3435118), we get a palindrome (84588548).

The spelling of 81153430 in words is "eighty-one million, one hundred fifty-three thousand, four hundred thirty".