261125495 has 4 divisors (see below), whose sum is σ = 313350600. Its totient is φ = 208900392.

The previous prime is 261125479. The next prime is 261125503. The reversal of 261125495 is 594521162.

It is a happy number.

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 261125495 - 2⁴ = 261125479 is a prime.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 26112545 + ... + 26112554.

It is an arithmetic number, because the mean of its divisors is an integer number (78337650).

Almost surely, 2^261125495 is an apocalyptic number.

261125495 is a deficient number, since it is larger than the sum of its proper divisors (52225105).

261125495 is an equidigital number, since it uses as much as digits as its factorization.

261125495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52225104.

The product of its digits is 21600, while the sum is 35.

The square root of 261125495 is about 16159.3779273832. The cubic root of 261125495 is about 639.1700627308.

The spelling of 261125495 in words is "two hundred sixty-one million, one hundred twenty-five thousand, four hundred ninety-five".