401243185981 has 8 divisors (see below), whose sum is σ = 439423032384. Its totient is φ = 363347205120.

The previous prime is 401243185979. The next prime is 401243185991. The reversal of 401243185981 is 189581342104.

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 401243185981 - 2¹ = 401243185979 is a prime.

It is a super-3 number, since 3×401243185981³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401243185991) 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, 70963425 + ... + 70969078.

It is an arithmetic number, because the mean of its divisors is an integer number (54927879048).

Almost surely, 2^401243185981 is an apocalyptic number.

It is an amenable number.

401243185981 is a deficient number, since it is larger than the sum of its proper divisors (38179846403).

401243185981 is a wasteful number, since it uses less digits than its factorization.

401243185981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141932771.

The product of its (nonzero) digits is 276480, while the sum is 46.

The spelling of 401243185981 in words is "four hundred one billion, two hundred forty-three million, one hundred eighty-five thousand, nine hundred eighty-one".