1165734261 has 20 divisors (see below), whose sum is σ = 1797583744. Its totient is φ = 752085000.

The previous prime is 1165734221. The next prime is 1165734313. The reversal of 1165734261 is 1624375611.

1165734261 is a `hidden beast` number, since 1 + 165 + 73 + 426 + 1 = 666.

It is not a de Polignac number, because 1165734261 - 2⁷ = 1165734133 is a prime.

It is a super-2 number, since 2×1165734261² = 2717872734538432242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165734221) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 229615 + ... + 234636.

Almost surely, 2^1165734261 is an apocalyptic number.

It is an amenable number.

1165734261 is a deficient number, since it is larger than the sum of its proper divisors (631849483).

1165734261 is an equidigital number, since it uses as much as digits as its factorization.

1165734261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464294 (or 464285 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 1165734261 is about 34142.8508036456. The cubic root of 1165734261 is about 1052.4460767938.

The spelling of 1165734261 in words is "one billion, one hundred sixty-five million, seven hundred thirty-four thousand, two hundred sixty-one".