400521061 has 2 divisors, whose sum is σ = 400521062. Its totient is φ = 400521060.

The previous prime is 400521029. The next prime is 400521113. The reversal of 400521061 is 160125004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 229068225 + 171452836 = 15135^2 + 13094^2 .

It is a cyclic number.

It is not a de Polignac number, because 400521061 - 2⁵ = 400521029 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400528061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200260530 + 200260531.

It is an arithmetic number, because the mean of its divisors is an integer number (200260531).

Almost surely, 2^400521061 is an apocalyptic number.

It is an amenable number.

400521061 is a deficient number, since it is larger than the sum of its proper divisors (1).

400521061 is an equidigital number, since it uses as much as digits as its factorization.

400521061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 400521061 is about 20013.0222855020. The cubic root of 400521061 is about 737.1260950970.

Adding to 400521061 its reverse (160125004), we get a palindrome (560646065).

The spelling of 400521061 in words is "four hundred million, five hundred twenty-one thousand, sixty-one".