215414261 has 2 divisors, whose sum is σ = 215414262. Its totient is φ = 215414260.

The previous prime is 215414249. The next prime is 215414263. The reversal of 215414261 is 162414512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212284900 + 3129361 = 14570^2 + 1769^2 .

It is a cyclic number.

It is not a de Polignac number, because 215414261 - 2¹⁸ = 215152117 is a prime.

It is a super-2 number, since 2×215414261² = 92806607684352242, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 215414263, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 215414261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215414263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107707130 + 107707131.

It is an arithmetic number, because the mean of its divisors is an integer number (107707131).

Almost surely, 2^215414261 is an apocalyptic number.

It is an amenable number.

215414261 is a deficient number, since it is larger than the sum of its proper divisors (1).

215414261 is an equidigital number, since it uses as much as digits as its factorization.

215414261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 26.

The square root of 215414261 is about 14676.9976834501. The cubic root of 215414261 is about 599.4571580933.

Adding to 215414261 its reverse (162414512), we get a palindrome (377828773).

The spelling of 215414261 in words is "two hundred fifteen million, four hundred fourteen thousand, two hundred sixty-one".