406284556981 has 4 divisors (see below), whose sum is σ = 419390510464. Its totient is φ = 393178603500.

The previous prime is 406284556963. The next prime is 406284556987. The reversal of 406284556981 is 189655482604.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 406284556981 - 2¹¹ = 406284554933 is a prime.

It is a super-2 number, since 2×406284556981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406284556987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6552976695 + ... + 6552976756.

It is an arithmetic number, because the mean of its divisors is an integer number (104847627616).

Almost surely, 2^406284556981 is an apocalyptic number.

It is an amenable number.

406284556981 is a deficient number, since it is larger than the sum of its proper divisors (13105953483).

406284556981 is a wasteful number, since it uses less digits than its factorization.

406284556981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13105953482.

The product of its (nonzero) digits is 16588800, while the sum is 58.

The spelling of 406284556981 in words is "four hundred six billion, two hundred eighty-four million, five hundred fifty-six thousand, nine hundred eighty-one".