215106901 has 2 divisors, whose sum is σ = 215106902. Its totient is φ = 215106900.

The previous prime is 215106889. The next prime is 215106919. The reversal of 215106901 is 109601512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199543876 + 15563025 = 14126^2 + 3945^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215106901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215100901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107553450 + 107553451.

It is an arithmetic number, because the mean of its divisors is an integer number (107553451).

Almost surely, 2^215106901 is an apocalyptic number.

It is an amenable number.

215106901 is a deficient number, since it is larger than the sum of its proper divisors (1).

215106901 is an equidigital number, since it uses as much as digits as its factorization.

215106901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 215106901 is about 14666.5231394492. The cubic root of 215106901 is about 599.1719141302.

The spelling of 215106901 in words is "two hundred fifteen million, one hundred six thousand, nine hundred one".