401809498243 has 4 divisors (see below), whose sum is σ = 401812487440. Its totient is φ = 401806509048.

The previous prime is 401809498241. The next prime is 401809498271. The reversal of 401809498243 is 342894908104.

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

It is a cyclic number.

It is not a de Polignac number, because 401809498243 - 2¹ = 401809498241 is a prime.

It is a super-2 number, since 2×401809498243² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401809498241) by changing a digit.

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, 1282980 + ... + 1565137.

It is an arithmetic number, because the mean of its divisors is an integer number (100453121860).

Almost surely, 2^401809498243 is an apocalyptic number.

401809498243 is a deficient number, since it is larger than the sum of its proper divisors (2989197).

401809498243 is a wasteful number, since it uses less digits than its factorization.

401809498243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2989196.

The product of its (nonzero) digits is 1990656, while the sum is 52.

The spelling of 401809498243 in words is "four hundred one billion, eight hundred nine million, four hundred ninety-eight thousand, two hundred forty-three".