40204431217 has 2 divisors, whose sum is σ = 40204431218. Its totient is φ = 40204431216.

The previous prime is 40204431173. The next prime is 40204431221. The reversal of 40204431217 is 71213440204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36218276721 + 3986154496 = 190311^2 + 63136^2 .

It is a cyclic number.

It is not a de Polignac number, because 40204431217 - 2²⁷ = 40070213489 is a prime.

It is not a weakly prime, because it can be changed into another prime (40204431317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20102215608 + 20102215609.

It is an arithmetic number, because the mean of its divisors is an integer number (20102215609).

Almost surely, 2^40204431217 is an apocalyptic number.

It is an amenable number.

40204431217 is a deficient number, since it is larger than the sum of its proper divisors (1).

40204431217 is an equidigital number, since it uses as much as digits as its factorization.

40204431217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 28.

The spelling of 40204431217 in words is "forty billion, two hundred four million, four hundred thirty-one thousand, two hundred seventeen".