1165924261 has 2 divisors, whose sum is σ = 1165924262. Its totient is φ = 1165924260.

The previous prime is 1165924241. The next prime is 1165924273. The reversal of 1165924261 is 1624295611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1096868161 + 69056100 = 33119^2 + 8310^2 .

It is a cyclic number.

It is not a de Polignac number, because 1165924261 - 2²¹ = 1163827109 is a prime.

It is a super-2 number, since 2×1165924261² = 2718758764776792242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1165924261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1165924241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 582962130 + 582962131.

It is an arithmetic number, because the mean of its divisors is an integer number (582962131).

Almost surely, 2^1165924261 is an apocalyptic number.

It is an amenable number.

1165924261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165924261 is an equidigital number, since it uses as much as digits as its factorization.

1165924261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 37.

The square root of 1165924261 is about 34145.6331175745. The cubic root of 1165924261 is about 1052.5032521720.

The spelling of 1165924261 in words is "one billion, one hundred sixty-five million, nine hundred twenty-four thousand, two hundred sixty-one".