81402801 has 8 divisors (see below), whose sum is σ = 108578784. Its totient is φ = 54247680.

The previous prime is 81402799. The next prime is 81402823. The reversal of 81402801 is 10820418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81402801 - 2¹ = 81402799 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81400801) 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, 12241 + ... + 17681.

It is an arithmetic number, because the mean of its divisors is an integer number (13572348).

Almost surely, 2^81402801 is an apocalyptic number.

It is an amenable number.

81402801 is a deficient number, since it is larger than the sum of its proper divisors (27175983).

81402801 is a wasteful number, since it uses less digits than its factorization.

81402801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10431.

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 81402801 is about 9022.3500818800. The cubic root of 81402801 is about 433.3908948519.

The spelling of 81402801 in words is "eighty-one million, four hundred two thousand, eight hundred one".