2061509987 has 4 divisors (see below), whose sum is σ = 2151140880. Its totient is φ = 1971879096.

The previous prime is 2061509939. The next prime is 2061510001. The reversal of 2061509987 is 7899051602.

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 2061509987 - 2¹⁰ = 2061508963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2061509287) 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, 44815412 + ... + 44815457.

It is an arithmetic number, because the mean of its divisors is an integer number (537785220).

Almost surely, 2^2061509987 is an apocalyptic number.

2061509987 is a deficient number, since it is larger than the sum of its proper divisors (89630893).

2061509987 is an equidigital number, since it uses as much as digits as its factorization.

2061509987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89630892.

The product of its (nonzero) digits is 272160, while the sum is 47.

The square root of 2061509987 is about 45403.8543187690. The cubic root of 2061509987 is about 1272.7071414096.

The spelling of 2061509987 in words is "two billion, sixty-one million, five hundred nine thousand, nine hundred eighty-seven".