261216103 has 2 divisors, whose sum is σ = 261216104. Its totient is φ = 261216102.

The previous prime is 261216097. The next prime is 261216127. The reversal of 261216103 is 301612162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261216103 - 2¹³ = 261207911 is a prime.

It is a super-3 number, since 3×261216103³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261216133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130608051 + 130608052.

It is an arithmetic number, because the mean of its divisors is an integer number (130608052).

Almost surely, 2^261216103 is an apocalyptic number.

261216103 is a deficient number, since it is larger than the sum of its proper divisors (1).

261216103 is an equidigital number, since it uses as much as digits as its factorization.

261216103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 261216103 is about 16162.1812574912. The cubic root of 261216103 is about 639.2439827742.

Adding to 261216103 its reverse (301612162), we get a palindrome (562828265).

The spelling of 261216103 in words is "two hundred sixty-one million, two hundred sixteen thousand, one hundred three".