261121444 has 6 divisors (see below), whose sum is σ = 456962534. Its totient is φ = 130560720.

The previous prime is 261121439. The next prime is 261121447. The reversal of 261121444 is 444121162.

It can be written as a sum of positive squares in only one way, i.e., 188018944 + 73102500 = 13712^2 + 8550^2 .

It is not an unprimeable number, because it can be changed into a prime (261121447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32640177 + ... + 32640184.

Almost surely, 2^261121444 is an apocalyptic number.

It is an amenable number.

261121444 is a deficient number, since it is larger than the sum of its proper divisors (195841090).

261121444 is a wasteful number, since it uses less digits than its factorization.

261121444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65280365 (or 65280363 counting only the distinct ones).

The product of its digits is 1536, while the sum is 25.

The square root of 261121444 is about 16159.2525817254. The cubic root of 261121444 is about 639.1667574346.

It can be divided in two parts, 26112 and 1444, that added together give a square (27556 = 166²).

The spelling of 261121444 in words is "two hundred sixty-one million, one hundred twenty-one thousand, four hundred forty-four".