261225163 has 2 divisors, whose sum is σ = 261225164. Its totient is φ = 261225162.

The previous prime is 261225137. The next prime is 261225197. The reversal of 261225163 is 361522162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261225163 - 2¹³ = 261216971 is a prime.

It is not a weakly prime, because it can be changed into another prime (261225763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130612581 + 130612582.

It is an arithmetic number, because the mean of its divisors is an integer number (130612582).

Almost surely, 2^261225163 is an apocalyptic number.

261225163 is a deficient number, since it is larger than the sum of its proper divisors (1).

261225163 is an equidigital number, since it uses as much as digits as its factorization.

261225163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 28.

The square root of 261225163 is about 16162.4615390107. The cubic root of 261225163 is about 639.2513731858.

The spelling of 261225163 in words is "two hundred sixty-one million, two hundred twenty-five thousand, one hundred sixty-three".