406013561 has 2 divisors, whose sum is σ = 406013562. Its totient is φ = 406013560.

The previous prime is 406013519. The next prime is 406013593. The reversal of 406013561 is 165310604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 364810000 + 41203561 = 19100^2 + 6419^2 .

It is a cyclic number.

It is not a de Polignac number, because 406013561 - 2²⁶ = 338904697 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 406013561.

It is not a weakly prime, because it can be changed into another prime (406016561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203006780 + 203006781.

It is an arithmetic number, because the mean of its divisors is an integer number (203006781).

Almost surely, 2^406013561 is an apocalyptic number.

It is an amenable number.

406013561 is a deficient number, since it is larger than the sum of its proper divisors (1).

406013561 is an equidigital number, since it uses as much as digits as its factorization.

406013561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 406013561 is about 20149.7781873647. The cubic root of 406013561 is about 740.4803072475.

The spelling of 406013561 in words is "four hundred six million, thirteen thousand, five hundred sixty-one".