2115788461 has 4 divisors (see below), whose sum is σ = 2155709052. Its totient is φ = 2075867872.

The previous prime is 2115788447. The next prime is 2115788473. The reversal of 2115788461 is 1648875112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1344615561 + 771172900 = 36669^2 + 27770^2 .

It is a cyclic number.

It is not a de Polignac number, because 2115788461 - 2⁵ = 2115788429 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 (2115788401) 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, 19960216 + ... + 19960321.

It is an arithmetic number, because the mean of its divisors is an integer number (538927263).

Almost surely, 2^2115788461 is an apocalyptic number.

It is an amenable number.

2115788461 is a deficient number, since it is larger than the sum of its proper divisors (39920591).

2115788461 is an equidigital number, since it uses as much as digits as its factorization.

2115788461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39920590.

The product of its digits is 107520, while the sum is 43.

The square root of 2115788461 is about 45997.7006055738. The cubic root of 2115788461 is about 1283.7804214033.

The spelling of 2115788461 in words is "two billion, one hundred fifteen million, seven hundred eighty-eight thousand, four hundred sixty-one".