261399883 has 2 divisors, whose sum is σ = 261399884. Its totient is φ = 261399882.

The previous prime is 261399877. The next prime is 261399907. The reversal of 261399883 is 388993162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261399883 - 2²¹ = 259302731 is a prime.

It is not a weakly prime, because it can be changed into another prime (261399863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130699941 + 130699942.

It is an arithmetic number, because the mean of its divisors is an integer number (130699942).

Almost surely, 2^261399883 is an apocalyptic number.

261399883 is a deficient number, since it is larger than the sum of its proper divisors (1).

261399883 is an equidigital number, since it uses as much as digits as its factorization.

261399883 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 49.

The square root of 261399883 is about 16167.8657527826. The cubic root of 261399883 is about 639.3938621491.

The spelling of 261399883 in words is "two hundred sixty-one million, three hundred ninety-nine thousand, eight hundred eighty-three".