400217689451 has 2 divisors, whose sum is σ = 400217689452. Its totient is φ = 400217689450.

The previous prime is 400217689447. The next prime is 400217689463. The reversal of 400217689451 is 154986712004.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400217689451 - 2² = 400217689447 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 400217689396 and 400217689405.

It is not a weakly prime, because it can be changed into another prime (400217689441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200108844725 + 200108844726.

It is an arithmetic number, because the mean of its divisors is an integer number (200108844726).

Almost surely, 2^400217689451 is an apocalyptic number.

400217689451 is a deficient number, since it is larger than the sum of its proper divisors (1).

400217689451 is an equidigital number, since it uses as much as digits as its factorization.

400217689451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 400217689451 in words is "four hundred billion, two hundred seventeen million, six hundred eighty-nine thousand, four hundred fifty-one".