2105249987 has 2 divisors, whose sum is σ = 2105249988. Its totient is φ = 2105249986.

The previous prime is 2105249969. The next prime is 2105250031. The reversal of 2105249987 is 7899425012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2105249987 - 2¹⁶ = 2105184451 is a prime.

It is not a weakly prime, because it can be changed into another prime (2105240987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052624993 + 1052624994.

It is an arithmetic number, because the mean of its divisors is an integer number (1052624994).

Almost surely, 2^2105249987 is an apocalyptic number.

2105249987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105249987 is an equidigital number, since it uses as much as digits as its factorization.

2105249987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 2105249987 is about 45883.0032473900. The cubic root of 2105249987 is about 1281.6454235956.

The spelling of 2105249987 in words is "two billion, one hundred five million, two hundred forty-nine thousand, nine hundred eighty-seven".