1138588261 has 2 divisors, whose sum is σ = 1138588262. Its totient is φ = 1138588260.

The previous prime is 1138588249. The next prime is 1138588291. The reversal of 1138588261 is 1628858311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 630311236 + 508277025 = 25106^2 + 22545^2 .

It is a cyclic number.

It is not a de Polignac number, because 1138588261 - 2¹⁹ = 1138063973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1138588291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569294130 + 569294131.

It is an arithmetic number, because the mean of its divisors is an integer number (569294131).

Almost surely, 2^1138588261 is an apocalyptic number.

It is an amenable number.

1138588261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1138588261 is an equidigital number, since it uses as much as digits as its factorization.

1138588261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92160, while the sum is 43.

The square root of 1138588261 is about 33742.9735056056. The cubic root of 1138588261 is about 1044.2125309865.

The spelling of 1138588261 in words is "one billion, one hundred thirty-eight million, five hundred eighty-eight thousand, two hundred sixty-one".