406576478981 has 2 divisors, whose sum is σ = 406576478982. Its totient is φ = 406576478980.

The previous prime is 406576478953. The next prime is 406576478983. The reversal of 406576478981 is 189874675604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 314928604225 + 91647874756 = 561185^2 + 302734^2 .

It is a cyclic number.

It is not a de Polignac number, because 406576478981 - 2³⁸ = 131698572037 is a prime.

It is a super-2 number, since 2×406576478981² (a number of 24 digits) contains 22 as substring.

Together with 406576478983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406576478983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203288239490 + 203288239491.

It is an arithmetic number, because the mean of its divisors is an integer number (203288239491).

Almost surely, 2^406576478981 is an apocalyptic number.

It is an amenable number.

406576478981 is a deficient number, since it is larger than the sum of its proper divisors (1).

406576478981 is an equidigital number, since it uses as much as digits as its factorization.

406576478981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81285120, while the sum is 65.

The spelling of 406576478981 in words is "four hundred six billion, five hundred seventy-six million, four hundred seventy-eight thousand, nine hundred eighty-one".