261130077 has 12 divisors (see below), whose sum is σ = 406202524. Its totient is φ = 160695360.

The previous prime is 261130069. The next prime is 261130087. The reversal of 261130077 is 770031162.

It can be written as a sum of positive squares in 2 ways, for example, as 55666521 + 205463556 = 7461^2 + 14334^2 .

It is not a de Polignac number, because 261130077 - 2³ = 261130069 is a prime.

It is a super-2 number, since 2×261130077² = 136377834228051858, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261130077.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261130087) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1115824 + ... + 1116057.

Almost surely, 2^261130077 is an apocalyptic number.

It is an amenable number.

261130077 is a deficient number, since it is larger than the sum of its proper divisors (145072447).

261130077 is a wasteful number, since it uses less digits than its factorization.

261130077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2231900 (or 2231897 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 261130077 is about 16159.5197020208. The cubic root of 261130077 is about 639.1738012399.

The spelling of 261130077 in words is "two hundred sixty-one million, one hundred thirty thousand, seventy-seven".