2145380987 has 2 divisors, whose sum is σ = 2145380988. Its totient is φ = 2145380986.

The previous prime is 2145380969. The next prime is 2145380989. The reversal of 2145380987 is 7890835412.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2145380987 - 2¹⁰ = 2145379963 is a prime.

Together with 2145380989, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2145380989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072690493 + 1072690494.

It is an arithmetic number, because the mean of its divisors is an integer number (1072690494).

Almost surely, 2^2145380987 is an apocalyptic number.

2145380987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145380987 is an equidigital number, since it uses as much as digits as its factorization.

2145380987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 47.

The square root of 2145380987 is about 46318.2575989210. The cubic root of 2145380987 is about 1289.7379406777.

The spelling of 2145380987 in words is "two billion, one hundred forty-five million, three hundred eighty thousand, nine hundred eighty-seven".