1165610621 has 16 divisors (see below), whose sum is σ = 1361276928. Its totient is φ = 977449200.

The previous prime is 1165610603. The next prime is 1165610647. The reversal of 1165610621 is 1260165611.

It is not a de Polignac number, because 1165610621 - 2⁶ = 1165610557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165610671) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 56156 + ... + 74058.

It is an arithmetic number, because the mean of its divisors is an integer number (85079808).

Almost surely, 2^1165610621 is an apocalyptic number.

It is an amenable number.

1165610621 is a deficient number, since it is larger than the sum of its proper divisors (195666307).

1165610621 is a wasteful number, since it uses less digits than its factorization.

1165610621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18112.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 1165610621 is about 34141.0401276821. The cubic root of 1165610621 is about 1052.4088673320.

The spelling of 1165610621 in words is "one billion, one hundred sixty-five million, six hundred ten thousand, six hundred twenty-one".