261359999 has 2 divisors, whose sum is σ = 261360000. Its totient is φ = 261359998.

The previous prime is 261359983. The next prime is 261360037. The reversal of 261359999 is 999953162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261359999 - 2⁴ = 261359983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261359999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261359939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130679999 + 130680000.

It is an arithmetic number, because the mean of its divisors is an integer number (130680000).

Almost surely, 2^261359999 is an apocalyptic number.

261359999 is a deficient number, since it is larger than the sum of its proper divisors (1).

261359999 is an equidigital number, since it uses as much as digits as its factorization.

261359999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1180980, while the sum is 53.

The square root of 261359999 is about 16166.6322714411. The cubic root of 261359999 is about 639.3613412445.

The spelling of 261359999 in words is "two hundred sixty-one million, three hundred fifty-nine thousand, nine hundred ninety-nine".