1139186261 has 2 divisors, whose sum is σ = 1139186262. Its totient is φ = 1139186260.

The previous prime is 1139186231. The next prime is 1139186263. The reversal of 1139186261 is 1626819311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1135285636 + 3900625 = 33694^2 + 1975^2 .

It is a cyclic number.

It is not a de Polignac number, because 1139186261 - 2²⁶ = 1072077397 is a prime.

Together with 1139186263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1139186263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569593130 + 569593131.

It is an arithmetic number, because the mean of its divisors is an integer number (569593131).

Almost surely, 2^1139186261 is an apocalyptic number.

It is an amenable number.

1139186261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1139186261 is an equidigital number, since it uses as much as digits as its factorization.

1139186261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 38.

The square root of 1139186261 is about 33751.8334464959. The cubic root of 1139186261 is about 1044.3953099084.

The spelling of 1139186261 in words is "one billion, one hundred thirty-nine million, one hundred eighty-six thousand, two hundred sixty-one".