801961443529 has 9 divisors (see below), whose sum is σ = 813480258279. Its totient is φ = 790603525320.

The previous prime is 801961443463. The next prime is 801961443553. The reversal of 801961443529 is 925344169108.

The square root of 801961443529 is 895523.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 338543604025 + 463417839504 = 581845^2 + 680748^2 .

It is not a de Polignac number, because 801961443529 - 2¹¹ = 801961441481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (801961443559) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 63575827 + ... + 63588439.

Almost surely, 2^801961443529 is an apocalyptic number.

801961443529 is the 895523-rd square number.

801961443529 is the 447762-nd centered octagonal number.

It is an amenable number.

801961443529 is a deficient number, since it is larger than the sum of its proper divisors (11518814750).

801961443529 is an frugal number, since it uses more digits than its factorization.

801961443529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25368 (or 12684 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 52.

The spelling of 801961443529 in words is "eight hundred one billion, nine hundred sixty-one million, four hundred forty-three thousand, five hundred twenty-nine".