1165053621 has 8 divisors (see below), whose sum is σ = 1556166240. Its totient is φ = 775321712.

The previous prime is 1165053607. The next prime is 1165053649. The reversal of 1165053621 is 1263505611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1165053621 - 2¹³ = 1165045429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165053601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 343206 + ... + 346583.

It is an arithmetic number, because the mean of its divisors is an integer number (194520780).

Almost surely, 2^1165053621 is an apocalyptic number.

It is an amenable number.

1165053621 is a deficient number, since it is larger than the sum of its proper divisors (391112619).

1165053621 is an equidigital number, since it uses as much as digits as its factorization.

1165053621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690355.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 1165053621 is about 34132.8818150475. The cubic root of 1165053621 is about 1052.2412055285.

The spelling of 1165053621 in words is "one billion, one hundred sixty-five million, fifty-three thousand, six hundred twenty-one".