261142365 has 32 divisors (see below), whose sum is σ = 479808000. Its totient is φ = 119949120.

The previous prime is 261142363. The next prime is 261142367. The reversal of 261142365 is 563241162.

It is an interprime number because it is at equal distance from previous prime (261142363) and next prime (261142367).

It is not a de Polignac number, because 261142365 - 2¹ = 261142363 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261142363) 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 31 ways as a sum of consecutive naturals, for example, 38515 + ... + 44784.

It is an arithmetic number, because the mean of its divisors is an integer number (14994000).

Almost surely, 2^261142365 is an apocalyptic number.

It is an amenable number.

261142365 is a deficient number, since it is larger than the sum of its proper divisors (218665635).

261142365 is a wasteful number, since it uses less digits than its factorization.

261142365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83337.

The product of its digits is 8640, while the sum is 30.

The square root of 261142365 is about 16159.8999068682. The cubic root of 261142365 is about 639.1838269514.

The spelling of 261142365 in words is "two hundred sixty-one million, one hundred forty-two thousand, three hundred sixty-five".