261094190237 has 2 divisors, whose sum is σ = 261094190238. Its totient is φ = 261094190236.

The previous prime is 261094190213. The next prime is 261094190257. The reversal of 261094190237 is 732091490162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 183037653241 + 78056536996 = 427829^2 + 279386^2 .

It is a cyclic number.

It is not a de Polignac number, because 261094190237 - 2⁸ = 261094189981 is a prime.

It is a super-2 number, since 2×261094190237² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261094190207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130547095118 + 130547095119.

It is an arithmetic number, because the mean of its divisors is an integer number (130547095119).

Almost surely, 2^261094190237 is an apocalyptic number.

It is an amenable number.

261094190237 is a deficient number, since it is larger than the sum of its proper divisors (1).

261094190237 is an equidigital number, since it uses as much as digits as its factorization.

261094190237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 44.

The spelling of 261094190237 in words is "two hundred sixty-one billion, ninety-four million, one hundred ninety thousand, two hundred thirty-seven".