261603141 has 8 divisors (see below), whose sum is σ = 360056064. Its totient is φ = 168776160.

The previous prime is 261603137. The next prime is 261603149. The reversal of 261603141 is 141306162.

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

It is not a de Polignac number, because 261603141 - 2² = 261603137 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261603149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1406376 + ... + 1406561.

It is an arithmetic number, because the mean of its divisors is an integer number (45007008).

Almost surely, 2^261603141 is an apocalyptic number.

It is an amenable number.

261603141 is a deficient number, since it is larger than the sum of its proper divisors (98452923).

261603141 is a wasteful number, since it uses less digits than its factorization.

261603141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2812971.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 261603141 is about 16174.1503949976. The cubic root of 261603141 is about 639.5595447623.

The spelling of 261603141 in words is "two hundred sixty-one million, six hundred three thousand, one hundred forty-one".