216431631401 has 2 divisors, whose sum is σ = 216431631402. Its totient is φ = 216431631400.

The previous prime is 216431631397. The next prime is 216431631499. The reversal of 216431631401 is 104136134612.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205661343001 + 10770288400 = 453499^2 + 103780^2 .

It is a cyclic number.

It is not a de Polignac number, because 216431631401 - 2² = 216431631397 is a prime.

It is not a weakly prime, because it can be changed into another prime (216431634401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108215815700 + 108215815701.

It is an arithmetic number, because the mean of its divisors is an integer number (108215815701).

Almost surely, 2^216431631401 is an apocalyptic number.

It is an amenable number.

216431631401 is a deficient number, since it is larger than the sum of its proper divisors (1).

216431631401 is an equidigital number, since it uses as much as digits as its factorization.

216431631401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 216431631401 in words is "two hundred sixteen billion, four hundred thirty-one million, six hundred thirty-one thousand, four hundred one".