261142913 has 8 divisors (see below), whose sum is σ = 269016000. Its totient is φ = 253351728.

The previous prime is 261142907. The next prime is 261142949. The reversal of 261142913 is 319241162.

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

It is a cyclic number.

It is not a de Polignac number, because 261142913 - 2¹⁰ = 261141889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261142613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13973 + ... + 26786.

It is an arithmetic number, because the mean of its divisors is an integer number (33627000).

Almost surely, 2^261142913 is an apocalyptic number.

It is an amenable number.

261142913 is a deficient number, since it is larger than the sum of its proper divisors (7873087).

261142913 is a wasteful number, since it uses less digits than its factorization.

261142913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40951.

The product of its digits is 2592, while the sum is 29.

The square root of 261142913 is about 16159.9168624099. The cubic root of 261142913 is about 639.1842740542.

The spelling of 261142913 in words is "two hundred sixty-one million, one hundred forty-two thousand, nine hundred thirteen".