1166351021 has 4 divisors (see below), whose sum is σ = 1272382944. Its totient is φ = 1060319100.

The previous prime is 1166350981. The next prime is 1166351027. The reversal of 1166351021 is 1201536611.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1166351021 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 (1166351027) 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, 53015945 + ... + 53015966.

It is an arithmetic number, because the mean of its divisors is an integer number (318095736).

Almost surely, 2^1166351021 is an apocalyptic number.

1166351021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1166351021 is a deficient number, since it is larger than the sum of its proper divisors (106031923).

1166351021 is a wasteful number, since it uses less digits than its factorization.

1166351021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106031922.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1166351021 is about 34151.8816611911. The cubic root of 1166351021 is about 1052.6316514491.

Adding to 1166351021 its reverse (1201536611), we get a palindrome (2367887632).

The spelling of 1166351021 in words is "one billion, one hundred sixty-six million, three hundred fifty-one thousand, twenty-one".