401216117509 has 2 divisors, whose sum is σ = 401216117510. Its totient is φ = 401216117508.

The previous prime is 401216117501. The next prime is 401216117593. The reversal of 401216117509 is 905711612104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208711922500 + 192504195009 = 456850^2 + 438753^2 .

It is a cyclic number.

It is not a de Polignac number, because 401216117509 - 2³ = 401216117501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401216117501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200608058754 + 200608058755.

It is an arithmetic number, because the mean of its divisors is an integer number (200608058755).

Almost surely, 2^401216117509 is an apocalyptic number.

It is an amenable number.

401216117509 is a deficient number, since it is larger than the sum of its proper divisors (1).

401216117509 is an equidigital number, since it uses as much as digits as its factorization.

401216117509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 37.

The spelling of 401216117509 in words is "four hundred one billion, two hundred sixteen million, one hundred seventeen thousand, five hundred nine".