261941287204 has 27 divisors (see below), whose sum is σ = 486980297587. Its totient is φ = 123258299264.

The previous prime is 261941287199. The next prime is 261941287261. The reversal of 261941287204 is 402782149162.

The square root of 261941287204 is 511802.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 152644927204 + 109296360000 = 390698^2 + 330600^2 .

It is a super-2 number, since 2×261941287204² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 17393742 + ... + 17408794.

Almost surely, 2^261941287204 is an apocalyptic number.

261941287204 is the 511802-nd square number.

It is an amenable number.

261941287204 is a deficient number, since it is larger than the sum of its proper divisors (225039010383).

261941287204 is an frugal number, since it uses more digits than its factorization.

261941287204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30144 (or 15072 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 46.

The spelling of 261941287204 in words is "two hundred sixty-one billion, nine hundred forty-one million, two hundred eighty-seven thousand, two hundred four".