400433210981 has 2 divisors, whose sum is σ = 400433210982. Its totient is φ = 400433210980.

The previous prime is 400433210939. The next prime is 400433211071. The reversal of 400433210981 is 189012334004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 310817400100 + 89615810881 = 557510^2 + 299359^2 .

It is a cyclic number.

It is not a de Polignac number, because 400433210981 - 2⁶ = 400433210917 is a prime.

It is a super-2 number, since 2×400433210981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400433210381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200216605490 + 200216605491.

It is an arithmetic number, because the mean of its divisors is an integer number (200216605491).

Almost surely, 2^400433210981 is an apocalyptic number.

It is an amenable number.

400433210981 is a deficient number, since it is larger than the sum of its proper divisors (1).

400433210981 is an equidigital number, since it uses as much as digits as its factorization.

400433210981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 35.

Adding to 400433210981 its reverse (189012334004), we get a palindrome (589445544985).

The spelling of 400433210981 in words is "four hundred billion, four hundred thirty-three million, two hundred ten thousand, nine hundred eighty-one".