400531513 has 2 divisors, whose sum is σ = 400531514. Its totient is φ = 400531512.

The previous prime is 400531511. The next prime is 400531531. The reversal of 400531513 is 315135004.

It is a happy number.

Together with next prime (400531531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 304432704 + 96098809 = 17448^2 + 9803^2 .

It is a cyclic number.

It is not a de Polignac number, because 400531513 - 2¹ = 400531511 is a prime.

Together with 400531511, it forms a pair of twin primes.

It is equal to p_21363115 and since 400531513 and 21363115 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (400531511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200265756 + 200265757.

It is an arithmetic number, because the mean of its divisors is an integer number (200265757).

Almost surely, 2^400531513 is an apocalyptic number.

It is an amenable number.

400531513 is a deficient number, since it is larger than the sum of its proper divisors (1).

400531513 is an equidigital number, since it uses as much as digits as its factorization.

400531513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 400531513 is about 20013.2834137730. The cubic root of 400531513 is about 737.1325070568.

Adding to 400531513 its reverse (315135004), we get a palindrome (715666517).

The spelling of 400531513 in words is "four hundred million, five hundred thirty-one thousand, five hundred thirteen".