402401413261 has 2 divisors, whose sum is σ = 402401413262. Its totient is φ = 402401413260.

The previous prime is 402401413199. The next prime is 402401413277. The reversal of 402401413261 is 162314104204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 265231180036 + 137170233225 = 515006^2 + 370365^2 .

It is a cyclic number.

It is not a de Polignac number, because 402401413261 - 2³¹ = 400253929613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402401413291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201200706630 + 201200706631.

It is an arithmetic number, because the mean of its divisors is an integer number (201200706631).

Almost surely, 2^402401413261 is an apocalyptic number.

It is an amenable number.

402401413261 is a deficient number, since it is larger than the sum of its proper divisors (1).

402401413261 is an equidigital number, since it uses as much as digits as its factorization.

402401413261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 402401413261 its reverse (162314104204), we get a palindrome (564715517465).

The spelling of 402401413261 in words is "four hundred two billion, four hundred one million, four hundred thirteen thousand, two hundred sixty-one".