1129313261 has 2 divisors, whose sum is σ = 1129313262. Its totient is φ = 1129313260.

The previous prime is 1129313249. The next prime is 1129313293. The reversal of 1129313261 is 1623139211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 809118025 + 320195236 = 28445^2 + 17894^2 .

It is a cyclic number.

It is not a de Polignac number, because 1129313261 - 2⁶ = 1129313197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1129313201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564656630 + 564656631.

It is an arithmetic number, because the mean of its divisors is an integer number (564656631).

Almost surely, 2^1129313261 is an apocalyptic number.

It is an amenable number.

1129313261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1129313261 is an equidigital number, since it uses as much as digits as its factorization.

1129313261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 29.

The square root of 1129313261 is about 33605.2564489545. The cubic root of 1129313261 is about 1041.3693933952.

The spelling of 1129313261 in words is "one billion, one hundred twenty-nine million, three hundred thirteen thousand, two hundred sixty-one".