261287098 has 8 divisors (see below), whose sum is σ = 394922880. Its totient is φ = 129646140.

The previous prime is 261287083. The next prime is 261287111. The reversal of 261287098 is 890782162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498378 + ... + 498901.

It is an arithmetic number, because the mean of its divisors is an integer number (49365360).

Almost surely, 2^261287098 is an apocalyptic number.

261287098 is a deficient number, since it is larger than the sum of its proper divisors (133635782).

261287098 is a wasteful number, since it uses less digits than its factorization.

261287098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997412.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 261287098 is about 16164.3774392953. The cubic root of 261287098 is about 639.3018901482.

The spelling of 261287098 in words is "two hundred sixty-one million, two hundred eighty-seven thousand, ninety-eight".