261513427 has 32 divisors (see below), whose sum is σ = 324993024. Its totient is φ = 205524000.

The previous prime is 261513407. The next prime is 261513437. The reversal of 261513427 is 724315162.

It is a cyclic number.

It is not a de Polignac number, because 261513427 - 2¹¹ = 261511379 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261513407) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 753468 + ... + 753814.

It is an arithmetic number, because the mean of its divisors is an integer number (10156032).

Almost surely, 2^261513427 is an apocalyptic number.

261513427 is a deficient number, since it is larger than the sum of its proper divisors (63479597).

261513427 is a wasteful number, since it uses less digits than its factorization.

261513427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559.

The product of its digits is 10080, while the sum is 31.

The square root of 261513427 is about 16171.3767812144. The cubic root of 261513427 is about 639.4864263675.

Adding to 261513427 its reverse (724315162), we get a palindrome (985828589).

The spelling of 261513427 in words is "two hundred sixty-one million, five hundred thirteen thousand, four hundred twenty-seven".