261854899 has 2 divisors, whose sum is σ = 261854900. Its totient is φ = 261854898.

The previous prime is 261854881. The next prime is 261854909. The reversal of 261854899 is 998458162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261854899 - 2⁷ = 261854771 is a prime.

It is not a weakly prime, because it can be changed into another prime (261854819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130927449 + 130927450.

It is an arithmetic number, because the mean of its divisors is an integer number (130927450).

Almost surely, 2^261854899 is an apocalyptic number.

261854899 is a deficient number, since it is larger than the sum of its proper divisors (1).

261854899 is an equidigital number, since it uses as much as digits as its factorization.

261854899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 52.

The square root of 261854899 is about 16181.9312506264. The cubic root of 261854899 is about 639.7646424627.

The spelling of 261854899 in words is "two hundred sixty-one million, eight hundred fifty-four thousand, eight hundred ninety-nine".