387216101 has 2 divisors, whose sum is σ = 387216102. Its totient is φ = 387216100.

The previous prime is 387216079. The next prime is 387216103. The reversal of 387216101 is 101612783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 244891201 + 142324900 = 15649^2 + 11930^2 .

It is a cyclic number.

It is not a de Polignac number, because 387216101 - 2¹⁰ = 387215077 is a prime.

It is a Sophie Germain prime.

Together with 387216103, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (387216103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193608050 + 193608051.

It is an arithmetic number, because the mean of its divisors is an integer number (193608051).

Almost surely, 2^387216101 is an apocalyptic number.

It is an amenable number.

387216101 is a deficient number, since it is larger than the sum of its proper divisors (1).

387216101 is an equidigital number, since it uses as much as digits as its factorization.

387216101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 387216101 is about 19677.8073219554. The cubic root of 387216101 is about 728.8717800891.

Adding to 387216101 its reverse (101612783), we get a palindrome (488828884).

The spelling of 387216101 in words is "three hundred eighty-seven million, two hundred sixteen thousand, one hundred one".