400131217 has 2 divisors, whose sum is σ = 400131218. Its totient is φ = 400131216.

The previous prime is 400131191. The next prime is 400131223. The reversal of 400131217 is 712131004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 328914496 + 71216721 = 18136^2 + 8439^2 .

It is a cyclic number.

It is not a de Polignac number, because 400131217 - 2¹⁹ = 399606929 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 400131194 and 400131203.

It is not a weakly prime, because it can be changed into another prime (400131817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200065608 + 200065609.

It is an arithmetic number, because the mean of its divisors is an integer number (200065609).

Almost surely, 2^400131217 is an apocalyptic number.

It is an amenable number.

400131217 is a deficient number, since it is larger than the sum of its proper divisors (1).

400131217 is an equidigital number, since it uses as much as digits as its factorization.

400131217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 400131217 is about 20003.2801560144. The cubic root of 400131217 is about 736.8868588466.

The spelling of 400131217 in words is "four hundred million, one hundred thirty-one thousand, two hundred seventeen".