801551681 has 8 divisors (see below), whose sum is σ = 938402304. Its totient is φ = 670286880.

The previous prime is 801551671. The next prime is 801551693. The reversal of 801551681 is 186155108.

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

It is a cyclic number.

It is not a de Polignac number, because 801551681 - 2¹⁰ = 801550657 is a prime.

It is a super-2 number, since 2×801551681² = 1284970194627851522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (801551671) 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, 1396145 + ... + 1396718.

It is an arithmetic number, because the mean of its divisors is an integer number (117300288).

Almost surely, 2^801551681 is an apocalyptic number.

It is an amenable number.

801551681 is a deficient number, since it is larger than the sum of its proper divisors (136850623).

801551681 is a wasteful number, since it uses less digits than its factorization.

801551681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2792911.

The product of its (nonzero) digits is 9600, while the sum is 35.

The square root of 801551681 is about 28311.6880634130. The cubic root of 801551681 is about 928.9175678648.

The spelling of 801551681 in words is "eight hundred one million, five hundred fifty-one thousand, six hundred eighty-one".