1002012197 has 4 divisors (see below), whose sum is σ = 1004244300. Its totient is φ = 999780096.

The previous prime is 1002012149. The next prime is 1002012211. The reversal of 1002012197 is 7912102001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7912102001 = 20123 ⋅393187.

It can be written as a sum of positive squares in 2 ways, for example, as 606439876 + 395572321 = 24626^2 + 19889^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002012197 - 2²⁴ = 985234981 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 (1002012797) 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 3 ways as a sum of consecutive naturals, for example, 1115378 + ... + 1116275.

It is an arithmetic number, because the mean of its divisors is an integer number (251061075).

Almost surely, 2^1002012197 is an apocalyptic number.

It is an amenable number.

1002012197 is a deficient number, since it is larger than the sum of its proper divisors (2232103).

1002012197 is an equidigital number, since it uses as much as digits as its factorization.

1002012197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2232102.

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 1002012197 is about 31654.5762410429. The cubic root of 1002012197 is about 1000.6702829537.

Adding to 1002012197 its reverse (7912102001), we get a palindrome (8914114198).

The spelling of 1002012197 in words is "one billion, two million, twelve thousand, one hundred ninety-seven".