261137131 has 2 divisors, whose sum is σ = 261137132. Its totient is φ = 261137130.

The previous prime is 261137113. The next prime is 261137167. The reversal of 261137131 is 131731162.

Together with previous prime (261137113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261137131 - 2¹³ = 261128939 is a prime.

It is a super-2 number, since 2×261137131² = 136385202373822322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 261137096 and 261137105.

It is not a weakly prime, because it can be changed into another prime (261137111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130568565 + 130568566.

It is an arithmetic number, because the mean of its divisors is an integer number (130568566).

Almost surely, 2^261137131 is an apocalyptic number.

261137131 is a deficient number, since it is larger than the sum of its proper divisors (1).

261137131 is an equidigital number, since it uses as much as digits as its factorization.

261137131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 25.

The square root of 261137131 is about 16159.7379619844. The cubic root of 261137131 is about 639.1795565981.

Adding to 261137131 its reverse (131731162), we get a palindrome (392868293).

The spelling of 261137131 in words is "two hundred sixty-one million, one hundred thirty-seven thousand, one hundred thirty-one".