820162487 has 2 divisors, whose sum is σ = 820162488. Its totient is φ = 820162486.

The previous prime is 820162429. The next prime is 820162489. The reversal of 820162487 is 784261028.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820162487 is a prime.

Together with 820162489, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 820162487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820162489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410081243 + 410081244.

It is an arithmetic number, because the mean of its divisors is an integer number (410081244).

Almost surely, 2^820162487 is an apocalyptic number.

820162487 is a deficient number, since it is larger than the sum of its proper divisors (1).

820162487 is an equidigital number, since it uses as much as digits as its factorization.

820162487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 820162487 is about 28638.4791321048. The cubic root of 820162487 is about 936.0519819032.

The spelling of 820162487 in words is "eight hundred twenty million, one hundred sixty-two thousand, four hundred eighty-seven".