261316407 has 16 divisors (see below), whose sum is σ = 380851200. Its totient is φ = 158059200.

The previous prime is 261316399. The next prime is 261316417. The reversal of 261316407 is 704613162.

It is not a de Polignac number, because 261316407 - 2³ = 261316399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261316417) 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 15 ways as a sum of consecutive naturals, for example, 9594 + ... + 24792.

It is an arithmetic number, because the mean of its divisors is an integer number (23803200).

Almost surely, 2^261316407 is an apocalyptic number.

261316407 is a deficient number, since it is larger than the sum of its proper divisors (119534793).

261316407 is a wasteful number, since it uses less digits than its factorization.

261316407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15734.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 261316407 is about 16165.2840061658. The cubic root of 261316407 is about 639.3257930997.

Adding to 261316407 its reverse (704613162), we get a palindrome (965929569).

The spelling of 261316407 in words is "two hundred sixty-one million, three hundred sixteen thousand, four hundred seven".