401531797805 has 4 divisors (see below), whose sum is σ = 481838157372. Its totient is φ = 321225438240.

The previous prime is 401531797781. The next prime is 401531797817. The reversal of 401531797805 is 508797135104.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 110257866601 + 291273931204 = 332051^2 + 539698^2 .

It is not a de Polignac number, because 401531797805 - 2⁸ = 401531797549 is a prime.

It is a super-2 number, since 2×401531797805² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40153179776 + ... + 40153179785.

It is an arithmetic number, because the mean of its divisors is an integer number (120459539343).

Almost surely, 2^401531797805 is an apocalyptic number.

It is an amenable number.

401531797805 is a deficient number, since it is larger than the sum of its proper divisors (80306359567).

401531797805 is an equidigital number, since it uses as much as digits as its factorization.

401531797805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80306359566.

The product of its (nonzero) digits is 1058400, while the sum is 50.

The spelling of 401531797805 in words is "four hundred one billion, five hundred thirty-one million, seven hundred ninety-seven thousand, eight hundred five".