1165685251 has 2 divisors, whose sum is σ = 1165685252. Its totient is φ = 1165685250.

The previous prime is 1165685249. The next prime is 1165685267. The reversal of 1165685251 is 1525865611.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1165685251 - 2¹ = 1165685249 is a prime.

Together with 1165685249, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1165685201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 582842625 + 582842626.

It is an arithmetic number, because the mean of its divisors is an integer number (582842626).

Almost surely, 2^1165685251 is an apocalyptic number.

1165685251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165685251 is an equidigital number, since it uses as much as digits as its factorization.

1165685251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72000, while the sum is 40.

The square root of 1165685251 is about 34142.1330763032. The cubic root of 1165685251 is about 1052.4313275476.

The spelling of 1165685251 in words is "one billion, one hundred sixty-five million, six hundred eighty-five thousand, two hundred fifty-one".