261781126 has 16 divisors (see below), whose sum is σ = 414259200. Its totient is φ = 123725448.

The previous prime is 261781103. The next prime is 261781133. The reversal of 261781126 is 621187162.

It is a junction number, because it is equal to n+sod(n) for n = 261781091 and 261781100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10155 + ... + 25033.

It is an arithmetic number, because the mean of its divisors is an integer number (25891200).

Almost surely, 2^261781126 is an apocalyptic number.

261781126 is a deficient number, since it is larger than the sum of its proper divisors (152478074).

261781126 is a wasteful number, since it uses less digits than its factorization.

261781126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15363.

The product of its digits is 8064, while the sum is 34.

The square root of 261781126 is about 16179.6516031712. The cubic root of 261781126 is about 639.7045560176.

The spelling of 261781126 in words is "two hundred sixty-one million, seven hundred eighty-one thousand, one hundred twenty-six".