2861392987 has 4 divisors (see below), whose sum is σ = 2893543560. Its totient is φ = 2829242416.

The previous prime is 2861392867. The next prime is 2861392997. The reversal of 2861392987 is 7892931682.

2861392987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-2861392987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2861392997) 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, 16075153 + ... + 16075330.

It is an arithmetic number, because the mean of its divisors is an integer number (723385890).

Almost surely, 2^2861392987 is an apocalyptic number.

2861392987 is a deficient number, since it is larger than the sum of its proper divisors (32150573).

2861392987 is an equidigital number, since it uses as much as digits as its factorization.

2861392987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32150572.

The product of its digits is 2612736, while the sum is 55.

The square root of 2861392987 is about 53491.9899330732. The cubic root of 2861392987 is about 1419.6866641517.

The spelling of 2861392987 in words is "two billion, eight hundred sixty-one million, three hundred ninety-two thousand, nine hundred eighty-seven".