870820499 has 2 divisors, whose sum is σ = 870820500. Its totient is φ = 870820498.

The previous prime is 870820481. The next prime is 870820513. The reversal of 870820499 is 994028078.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-870820499 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (870820459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435410249 + 435410250.

It is an arithmetic number, because the mean of its divisors is an integer number (435410250).

Almost surely, 2^870820499 is an apocalyptic number.

870820499 is a deficient number, since it is larger than the sum of its proper divisors (1).

870820499 is an equidigital number, since it uses as much as digits as its factorization.

870820499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 870820499 is about 29509.6678903711. The cubic root of 870820499 is about 954.9402844526.

The spelling of 870820499 in words is "eight hundred seventy million, eight hundred twenty thousand, four hundred ninety-nine".