261153443 has 4 divisors (see below), whose sum is σ = 262883088. Its totient is φ = 259423800.

The previous prime is 261153421. The next prime is 261153463. The reversal of 261153443 is 344351162.

261153443 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261153443 - 2⁸ = 261153187 is a prime.

It is a super-2 number, since 2×261153443² = 136402241581508498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261153413) 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, 864596 + ... + 864897.

It is an arithmetic number, because the mean of its divisors is an integer number (65720772).

Almost surely, 2^261153443 is an apocalyptic number.

261153443 is a deficient number, since it is larger than the sum of its proper divisors (1729645).

261153443 is a wasteful number, since it uses less digits than its factorization.

261153443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1729644.

The product of its digits is 8640, while the sum is 29.

The square root of 261153443 is about 16160.2426652572. The cubic root of 261153443 is about 639.1928651610.

The spelling of 261153443 in words is "two hundred sixty-one million, one hundred fifty-three thousand, four hundred forty-three".