261183137 has 2 divisors, whose sum is σ = 261183138. Its totient is φ = 261183136.

The previous prime is 261183127. The next prime is 261183149. The reversal of 261183137 is 731381162.

261183137 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172239376 + 88943761 = 13124^2 + 9431^2 .

It is a cyclic number.

It is not a de Polignac number, because 261183137 - 2⁸ = 261182881 is a prime.

It is not a weakly prime, because it can be changed into another prime (261183107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130591568 + 130591569.

It is an arithmetic number, because the mean of its divisors is an integer number (130591569).

Almost surely, 2^261183137 is an apocalyptic number.

It is an amenable number.

261183137 is a deficient number, since it is larger than the sum of its proper divisors (1).

261183137 is an equidigital number, since it uses as much as digits as its factorization.

261183137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 32.

The square root of 261183137 is about 16161.1613753468. The cubic root of 261183137 is about 639.2170903488.

The spelling of 261183137 in words is "two hundred sixty-one million, one hundred eighty-three thousand, one hundred thirty-seven".