402490005241 has 3 divisors (see below), whose sum is σ = 402490639663. Its totient is φ = 402489370820.

The previous prime is 402490005221. The next prime is 402490005289. The reversal of 402490005241 is 142500094204.

The square root of 402490005241 is 634421.

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., 139710740841 + 262779264400 = 373779^2 + 512620^2 .

It is not a de Polignac number, because 402490005241 - 2²¹ = 402487908089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402490005221) 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, 317211 + ... + 951631.

Almost surely, 2^402490005241 is an apocalyptic number.

402490005241 is the 634421-st square number.

402490005241 is the 317211-st centered octagonal number.

It is an amenable number.

402490005241 is a deficient number, since it is larger than the sum of its proper divisors (634422).

402490005241 is an frugal number, since it uses more digits than its factorization.

402490005241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1268842 (or 634421 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 402490005241 its reverse (142500094204), we get a palindrome (544990099445).

The spelling of 402490005241 in words is "four hundred two billion, four hundred ninety million, five thousand, two hundred forty-one".