1164535621 has 4 divisors (see below), whose sum is σ = 1164899500. Its totient is φ = 1164171744.

The previous prime is 1164535607. The next prime is 1164535627. The reversal of 1164535621 is 1265354611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1265354611 = 7207 ⋅175573.

It can be written as a sum of positive squares in 2 ways, for example, as 535228225 + 629307396 = 23135^2 + 25086^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1164535621 is a prime.

It is a super-2 number, since 2×1164535621² = 2712286425155711282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1164535627) 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, 177096 + ... + 183553.

It is an arithmetic number, because the mean of its divisors is an integer number (291224875).

Almost surely, 2^1164535621 is an apocalyptic number.

It is an amenable number.

1164535621 is a deficient number, since it is larger than the sum of its proper divisors (363879).

1164535621 is an equidigital number, since it uses as much as digits as its factorization.

1164535621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363878.

The product of its digits is 21600, while the sum is 34.

The square root of 1164535621 is about 34125.2929804273. The cubic root of 1164535621 is about 1052.0852350978.

The spelling of 1164535621 in words is "one billion, one hundred sixty-four million, five hundred thirty-five thousand, six hundred twenty-one".