261125759 has 4 divisors (see below), whose sum is σ = 274869240. Its totient is φ = 247382280.

The previous prime is 261125633. The next prime is 261125789. The reversal of 261125759 is 957521162.

It is a happy number.

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

It is not a de Polignac number, because 261125759 - 2⁸ = 261125503 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 (261125789) 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, 6871712 + ... + 6871749.

It is an arithmetic number, because the mean of its divisors is an integer number (68717310).

Almost surely, 2^261125759 is an apocalyptic number.

261125759 is a deficient number, since it is larger than the sum of its proper divisors (13743481).

261125759 is a wasteful number, since it uses less digits than its factorization.

261125759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13743480.

The product of its digits is 37800, while the sum is 38.

The square root of 261125759 is about 16159.3860960124. The cubic root of 261125759 is about 639.1702781328.

The spelling of 261125759 in words is "two hundred sixty-one million, one hundred twenty-five thousand, seven hundred fifty-nine".