406213747801 has 3 divisors (see below), whose sum is σ = 406214385151. Its totient is φ = 406213110452.

The previous prime is 406213747781. The next prime is 406213747939. The reversal of 406213747801 is 108747312604.

The square root of 406213747801 is 637349.

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., 85789824201 + 320423923600 = 292899^2 + 566060^2 .

It is not a de Polignac number, because 406213747801 - 2²³ = 406205359193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406213747301) 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, 318675 + ... + 956023.

Almost surely, 2^406213747801 is an apocalyptic number.

406213747801 is the 637349-th square number.

406213747801 is the 318675-th centered octagonal number.

It is an amenable number.

406213747801 is a deficient number, since it is larger than the sum of its proper divisors (637350).

406213747801 is an frugal number, since it uses more digits than its factorization.

406213747801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1274698 (or 637349 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 43.

The spelling of 406213747801 in words is "four hundred six billion, two hundred thirteen million, seven hundred forty-seven thousand, eight hundred one".