261126015 has 16 divisors (see below), whose sum is σ = 435967488. Its totient is φ = 133211936.

The previous prime is 261125999. The next prime is 261126029. The reversal of 261126015 is 510621162.

It is a cyclic number.

It is not a de Polignac number, because 261126015 - 2⁴ = 261125999 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 (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 378099 + ... + 378788.

It is an arithmetic number, because the mean of its divisors is an integer number (27247968).

Almost surely, 2^261126015 is an apocalyptic number.

261126015 is a deficient number, since it is larger than the sum of its proper divisors (174841473).

261126015 is a wasteful number, since it uses less digits than its factorization.

261126015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756918.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 261126015 is about 16159.3940171035. The cubic root of 261126015 is about 639.1704870073.

Adding to 261126015 its reverse (510621162), we get a palindrome (771747177).

The spelling of 261126015 in words is "two hundred sixty-one million, one hundred twenty-six thousand, fifteen".