261125543 has 8 divisors (see below), whose sum is σ = 298659360. Its totient is φ = 223649280.

The previous prime is 261125537. The next prime is 261125549. The reversal of 261125543 is 345521162.

It is an interprime number because it is at equal distance from previous prime (261125537) and next prime (261125549).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261125543 - 2⁶ = 261125479 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 (261125549) 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, 4178 + ... + 23231.

It is an arithmetic number, because the mean of its divisors is an integer number (37332420).

Almost surely, 2^261125543 is an apocalyptic number.

261125543 is a deficient number, since it is larger than the sum of its proper divisors (37533817).

261125543 is a wasteful number, since it uses less digits than its factorization.

261125543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28777.

The product of its digits is 7200, while the sum is 29.

The square root of 261125543 is about 16159.3794125888. The cubic root of 261125543 is about 639.1701018948.

It can be divided in two parts, 261 and 125543, that multiplied together give a palindrome (32766723).

The spelling of 261125543 in words is "two hundred sixty-one million, one hundred twenty-five thousand, five hundred forty-three".