400855061 has 2 divisors, whose sum is σ = 400855062. Its totient is φ = 400855060.

The previous prime is 400855033. The next prime is 400855099. The reversal of 400855061 is 160558004.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 361228036 + 39627025 = 19006^2 + 6295^2 .

It is a cyclic number.

It is not a de Polignac number, because 400855061 - 2²⁶ = 333746197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400855001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200427530 + 200427531.

It is an arithmetic number, because the mean of its divisors is an integer number (200427531).

Almost surely, 2^400855061 is an apocalyptic number.

It is an amenable number.

400855061 is a deficient number, since it is larger than the sum of its proper divisors (1).

400855061 is an equidigital number, since it uses as much as digits as its factorization.

400855061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 400855061 is about 20021.3651132983. The cubic root of 400855061 is about 737.3309380169.

The spelling of 400855061 in words is "four hundred million, eight hundred fifty-five thousand, sixty-one".