1146665021 has 4 divisors (see below), whose sum is σ = 1147458912. Its totient is φ = 1145871132.

The previous prime is 1146664973. The next prime is 1146665041. The reversal of 1146665021 is 1205666411.

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: 1205666411 = 12653 ⋅95287.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1146665021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1146665041) 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, 394775 + ... + 397668.

It is an arithmetic number, because the mean of its divisors is an integer number (286864728).

Almost surely, 2^1146665021 is an apocalyptic number.

It is an amenable number.

1146665021 is a deficient number, since it is larger than the sum of its proper divisors (793891).

1146665021 is an equidigital number, since it uses as much as digits as its factorization.

1146665021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793890.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1146665021 is about 33862.4426319189. The cubic root of 1146665021 is about 1046.6758124052.

The spelling of 1146665021 in words is "one billion, one hundred forty-six million, six hundred sixty-five thousand, twenty-one".