406551869 has 2 divisors, whose sum is σ = 406551870. Its totient is φ = 406551868.

The previous prime is 406551863. The next prime is 406551877. The reversal of 406551869 is 968155604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 302307769 + 104244100 = 17387^2 + 10210^2 .

It is a cyclic number.

It is not a de Polignac number, because 406551869 - 2¹² = 406547773 is a prime.

It is a super-2 number, since 2×406551869² = 330568844374786322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406551863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203275934 + 203275935.

It is an arithmetic number, because the mean of its divisors is an integer number (203275935).

Almost surely, 2^406551869 is an apocalyptic number.

It is an amenable number.

406551869 is a deficient number, since it is larger than the sum of its proper divisors (1).

406551869 is an equidigital number, since it uses as much as digits as its factorization.

406551869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 44.

The square root of 406551869 is about 20163.1314284265. The cubic root of 406551869 is about 740.8074149098.

It can be divided in two parts, 40655 and 1869, that added together give a palindrome (42524).

The spelling of 406551869 in words is "four hundred six million, five hundred fifty-one thousand, eight hundred sixty-nine".