261320536 has 16 divisors (see below), whose sum is σ = 494556840. Its totient is φ = 129438720.

The previous prime is 261320533. The next prime is 261320539. The reversal of 261320536 is 635023162.

It is an interprime number because it is at equal distance from previous prime (261320533) and next prime (261320539).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261320531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151785 + ... + 153496.

Almost surely, 2^261320536 is an apocalyptic number.

It is an amenable number.

261320536 is a deficient number, since it is larger than the sum of its proper divisors (233236304).

261320536 is a wasteful number, since it uses less digits than its factorization.

261320536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305394 (or 305390 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 261320536 is about 16165.4117176149. The cubic root of 261320536 is about 639.3291603616.

Adding to 261320536 its reverse (635023162), we get a palindrome (896343698).

The spelling of 261320536 in words is "two hundred sixty-one million, three hundred twenty thousand, five hundred thirty-six".