401832661 has 4 divisors (see below), whose sum is σ = 407337292. Its totient is φ = 396328032.

The previous prime is 401832659. The next prime is 401832679. The reversal of 401832661 is 166238104.

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 348979761 + 52852900 = 18681^2 + 7270^2 .

It is a cyclic number.

It is not a de Polignac number, because 401832661 - 2¹ = 401832659 is a prime.

It is a super-2 number, since 2×401832661² = 322938974892681842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401832161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2752206 + ... + 2752351.

It is an arithmetic number, because the mean of its divisors is an integer number (101834323).

Almost surely, 2^401832661 is an apocalyptic number.

It is an amenable number.

401832661 is a deficient number, since it is larger than the sum of its proper divisors (5504631).

401832661 is an equidigital number, since it uses as much as digits as its factorization.

401832661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5504630.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 401832661 is about 20045.7641660277. The cubic root of 401832661 is about 737.9298490420.

The spelling of 401832661 in words is "four hundred one million, eight hundred thirty-two thousand, six hundred sixty-one".