1165225501 has 4 divisors (see below), whose sum is σ = 1271155104. Its totient is φ = 1059295900.

The previous prime is 1165225447. The next prime is 1165225513. The reversal of 1165225501 is 1055225611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1055225611 = 11 ⋅95929601.

It is a cyclic number.

It is not a de Polignac number, because 1165225501 - 2¹¹ = 1165223453 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1165225501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165226501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52964785 + ... + 52964806.

It is an arithmetic number, because the mean of its divisors is an integer number (317788776).

Almost surely, 2^1165225501 is an apocalyptic number.

1165225501 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1165225501 is a deficient number, since it is larger than the sum of its proper divisors (105929603).

1165225501 is a wasteful number, since it uses less digits than its factorization.

1165225501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105929602.

The product of its (nonzero) digits is 3000, while the sum is 28.

The square root of 1165225501 is about 34135.3995289348. The cubic root of 1165225501 is about 1052.2929485904.

The spelling of 1165225501 in words is "one billion, one hundred sixty-five million, two hundred twenty-five thousand, five hundred one".