81403353 has 32 divisors (see below), whose sum is σ = 128217600. Its totient is φ = 50897808.

The previous prime is 81403349. The next prime is 81403363. The reversal of 81403353 is 35330418.

It is a happy number.

It is not a de Polignac number, because 81403353 - 2² = 81403349 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (81403313) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54150 + ... + 55632.

It is an arithmetic number, because the mean of its divisors is an integer number (4006800).

Almost surely, 2^81403353 is an apocalyptic number.

It is an amenable number.

81403353 is a deficient number, since it is larger than the sum of its proper divisors (46814247).

81403353 is a wasteful number, since it uses less digits than its factorization.

81403353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1618 (or 1612 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 81403353 is about 9022.3806725276. The cubic root of 81403353 is about 433.3918744710.

The spelling of 81403353 in words is "eighty-one million, four hundred three thousand, three hundred fifty-three".