261651883 has 2 divisors, whose sum is σ = 261651884. Its totient is φ = 261651882.

The previous prime is 261651853. The next prime is 261651893. The reversal of 261651883 is 388156162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261651883 - 2²¹ = 259554731 is a prime.

It is not a weakly prime, because it can be changed into another prime (261651853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130825941 + 130825942.

It is an arithmetic number, because the mean of its divisors is an integer number (130825942).

Almost surely, 2^261651883 is an apocalyptic number.

261651883 is a deficient number, since it is larger than the sum of its proper divisors (1).

261651883 is an equidigital number, since it uses as much as digits as its factorization.

261651883 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 40.

The square root of 261651883 is about 16175.6571118456. The cubic root of 261651883 is about 639.5992632908.

The spelling of 261651883 in words is "two hundred sixty-one million, six hundred fifty-one thousand, eight hundred eighty-three".