1000212091 has 4 divisors (see below), whose sum is σ = 1009922992. Its totient is φ = 990501192.

The previous prime is 1000212077. The next prime is 1000212107. The reversal of 1000212091 is 1902120001.

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

It is a cyclic number.

It is not a de Polignac number, because 1000212091 - 2⁷ = 1000211963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1000212011) 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, 4855296 + ... + 4855501.

It is an arithmetic number, because the mean of its divisors is an integer number (252480748).

Almost surely, 2^1000212091 is an apocalyptic number.

1000212091 is a deficient number, since it is larger than the sum of its proper divisors (9710901).

1000212091 is an equidigital number, since it uses as much as digits as its factorization.

1000212091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9710900.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 1000212091 is about 31626.1298770495. The cubic root of 1000212091 is about 1000.0706920025.

Adding to 1000212091 its reverse (1902120001), we get a palindrome (2902332092).

The spelling of 1000212091 in words is "one billion, two hundred twelve thousand, ninety-one".