261300128 has 12 divisors (see below), whose sum is σ = 514434690. Its totient is φ = 130650048.

The previous prime is 261300089. The next prime is 261300133. The reversal of 261300128 is 821003162.

It can be written as a sum of positive squares in only one way, i.e., 191877904 + 69422224 = 13852^2 + 8332^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4082783 + ... + 4082846.

Almost surely, 2^261300128 is an apocalyptic number.

It is an amenable number.

261300128 is a deficient number, since it is larger than the sum of its proper divisors (253134562).

261300128 is an equidigital number, since it uses as much as digits as its factorization.

261300128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8165639 (or 8165631 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 261300128 is about 16164.7804810334. The cubic root of 261300128 is about 639.3125169839.

The spelling of 261300128 in words is "two hundred sixty-one million, three hundred thousand, one hundred twenty-eight".