2111612651 has 4 divisors (see below), whose sum is σ = 2115024600. Its totient is φ = 2108200704.

The previous prime is 2111612639. The next prime is 2111612683. The reversal of 2111612651 is 1562161112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2111612651 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2111612651.

It is not an unprimeable number, because it can be changed into a prime (2111615651) 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, 1705046 + ... + 1706283.

It is an arithmetic number, because the mean of its divisors is an integer number (528756150).

Almost surely, 2^2111612651 is an apocalyptic number.

2111612651 is a deficient number, since it is larger than the sum of its proper divisors (3411949).

2111612651 is an equidigital number, since it uses as much as digits as its factorization.

2111612651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3411948.

The product of its digits is 720, while the sum is 26.

The square root of 2111612651 is about 45952.2866786844. The cubic root of 2111612651 is about 1282.9352906360.

Adding to 2111612651 its reverse (1562161112), we get a palindrome (3673773763).

The spelling of 2111612651 in words is "two billion, one hundred eleven million, six hundred twelve thousand, six hundred fifty-one".