215115401 has 2 divisors, whose sum is σ = 215115402. Its totient is φ = 215115400.

The previous prime is 215115377. The next prime is 215115421. The reversal of 215115401 is 104511512.

It is an a-pointer prime, because the next prime (215115421) can be obtained adding 215115401 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187279225 + 27836176 = 13685^2 + 5276^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215115401 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (215115421) 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, 107557700 + 107557701.

It is an arithmetic number, because the mean of its divisors is an integer number (107557701).

Almost surely, 2^215115401 is an apocalyptic number.

It is an amenable number.

215115401 is a deficient number, since it is larger than the sum of its proper divisors (1).

215115401 is an equidigital number, since it uses as much as digits as its factorization.

215115401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 215115401 is about 14666.8129121497. The cubic root of 215115401 is about 599.1798061662.

Adding to 215115401 its reverse (104511512), we get a palindrome (319626913).

The spelling of 215115401 in words is "two hundred fifteen million, one hundred fifteen thousand, four hundred one".