401318449009 has 3 divisors (see below), whose sum is σ = 401319082507. Its totient is φ = 401317815512.

The previous prime is 401318448983. The next prime is 401318449019. The reversal of 401318449009 is 900944813104.

The square root of 401318449009 is 633497.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1732640625 + 399585808384 = 41625^2 + 632128^2 .

It is not a de Polignac number, because 401318449009 - 2¹⁵ = 401318416241 is a prime.

It is a super-2 number, since 2×401318449009² (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 (401318449019) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 316749 + ... + 950245.

Almost surely, 2^401318449009 is an apocalyptic number.

401318449009 is the 633497-th square number.

401318449009 is the 316749-th centered octagonal number.

It is an amenable number.

401318449009 is a deficient number, since it is larger than the sum of its proper divisors (633498).

401318449009 is an frugal number, since it uses more digits than its factorization.

401318449009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266994 (or 633497 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 43.

The spelling of 401318449009 in words is "four hundred one billion, three hundred eighteen million, four hundred forty-nine thousand, nine".