261542413 has 4 divisors (see below), whose sum is σ = 285319008. Its totient is φ = 237765820.

The previous prime is 261542311. The next prime is 261542447. The reversal of 261542413 is 314245162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261542413 - 2¹⁷ = 261411341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261542483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11888281 + ... + 11888302.

It is an arithmetic number, because the mean of its divisors is an integer number (71329752).

Almost surely, 2^261542413 is an apocalyptic number.

It is an amenable number.

261542413 is a deficient number, since it is larger than the sum of its proper divisors (23776595).

261542413 is a wasteful number, since it uses less digits than its factorization.

261542413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23776594.

The product of its digits is 5760, while the sum is 28.

The square root of 261542413 is about 16172.2729694994. The cubic root of 261542413 is about 639.5100522656.

Adding to 261542413 its reverse (314245162), we get a palindrome (575787575).

The spelling of 261542413 in words is "two hundred sixty-one million, five hundred forty-two thousand, four hundred thirteen".