405542051 has 2 divisors, whose sum is σ = 405542052. Its totient is φ = 405542050.

The previous prime is 405542047. The next prime is 405542063. The reversal of 405542051 is 150245504.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 405542051 - 2² = 405542047 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 405542051.

It is not a weakly prime, because it can be changed into another prime (405542041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202771025 + 202771026.

It is an arithmetic number, because the mean of its divisors is an integer number (202771026).

Almost surely, 2^405542051 is an apocalyptic number.

405542051 is a deficient number, since it is larger than the sum of its proper divisors (1).

405542051 is an equidigital number, since it uses as much as digits as its factorization.

405542051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 405542051 is about 20138.0746597087. The cubic root of 405542051 is about 740.1935523654.

Adding to 405542051 its reverse (150245504), we get a palindrome (555787555).

The spelling of 405542051 in words is "four hundred five million, five hundred forty-two thousand, fifty-one".