261201130 has 16 divisors (see below), whose sum is σ = 482869800. Its totient is φ = 101656512.

The previous prime is 261201121. The next prime is 261201131. The reversal of 261201130 is 31102162.

It can be written as a sum of positive squares in 4 ways, for example, as 203091001 + 58110129 = 14251^2 + 7623^2 .

It is not an unprimeable number, because it can be changed into a prime (261201131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 352605 + ... + 353344.

Almost surely, 2^261201130 is an apocalyptic number.

261201130 is a deficient number, since it is larger than the sum of its proper divisors (221668670).

261201130 is a wasteful number, since it uses less digits than its factorization.

261201130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705993.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 261201130 is about 16161.7180398620. The cubic root of 261201130 is about 639.2317686433.

Adding to 261201130 its reverse (31102162), we get a palindrome (292303292).

The spelling of 261201130 in words is "two hundred sixty-one million, two hundred one thousand, one hundred thirty".