1066243251 has 4 divisors (see below), whose sum is σ = 1421657672. Its totient is φ = 710828832.

The previous prime is 1066243249. The next prime is 1066243259. The reversal of 1066243251 is 1523426601.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1066243251 - 2¹ = 1066243249 is a prime.

It is a super-3 number, since 3×1066243251³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1066243259) 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, 177707206 + ... + 177707211.

It is an arithmetic number, because the mean of its divisors is an integer number (355414418).

Almost surely, 2^1066243251 is an apocalyptic number.

1066243251 is a deficient number, since it is larger than the sum of its proper divisors (355414421).

1066243251 is an equidigital number, since it uses as much as digits as its factorization.

1066243251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355414420.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1066243251 is about 32653.3803916225. The cubic root of 1066243251 is about 1021.6106972075.

Adding to 1066243251 its reverse (1523426601), we get a palindrome (2589669852).

The spelling of 1066243251 in words is "one billion, sixty-six million, two hundred forty-three thousand, two hundred fifty-one".