1172016765 has 12 divisors (see below), whose sum is σ = 2031495804. Its totient is φ = 625075584.

The previous prime is 1172016731. The next prime is 1172016787. The reversal of 1172016765 is 5676102711.

It can be written as a sum of positive squares in 2 ways, for example, as 232349049 + 939667716 = 15243^2 + 30654^2 .

It is not a de Polignac number, because 1172016765 - 2¹¹ = 1172014717 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13022364 + ... + 13022453.

It is an arithmetic number, because the mean of its divisors is an integer number (169291317).

Almost surely, 2^1172016765 is an apocalyptic number.

1172016765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1172016765 is a deficient number, since it is larger than the sum of its proper divisors (859479039).

1172016765 is a wasteful number, since it uses less digits than its factorization.

1172016765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26044828 (or 26044825 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

The square root of 1172016765 is about 34234.7303918112. The cubic root of 1172016765 is about 1054.3333434176. Note that the first 4 decimals are identical.

The spelling of 1172016765 in words is "one billion, one hundred seventy-two million, sixteen thousand, seven hundred sixty-five".