261143393 has 8 divisors (see below), whose sum is σ = 304540800. Its totient is φ = 223836900.

The previous prime is 261143387. The next prime is 261143401. The reversal of 261143393 is 393341162.

It is not a de Polignac number, because 261143393 - 2⁶ = 261143329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261143383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 380333 + ... + 381018.

It is an arithmetic number, because the mean of its divisors is an integer number (38067600).

Almost surely, 2^261143393 is an apocalyptic number.

It is an amenable number.

261143393 is a deficient number, since it is larger than the sum of its proper divisors (43397407).

261143393 is an frugal number, since it uses more digits than its factorization.

261143393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761372 (or 761358 counting only the distinct ones).

The product of its digits is 11664, while the sum is 32.

The square root of 261143393 is about 16159.9317139646. The cubic root of 261143393 is about 639.1846656767.

The spelling of 261143393 in words is "two hundred sixty-one million, one hundred forty-three thousand, three hundred ninety-three".