870820481 has 2 divisors, whose sum is σ = 870820482. Its totient is φ = 870820480.

The previous prime is 870820459. The next prime is 870820499. The reversal of 870820481 is 184028078.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 862890625 + 7929856 = 29375^2 + 2816^2 .

It is a cyclic number.

It is not a de Polignac number, because 870820481 - 2⁶ = 870820417 is a prime.

It is a super-2 number, since 2×870820481² = 1516656620258142722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (870820441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435410240 + 435410241.

It is an arithmetic number, because the mean of its divisors is an integer number (435410241).

Almost surely, 2^870820481 is an apocalyptic number.

It is an amenable number.

870820481 is a deficient number, since it is larger than the sum of its proper divisors (1).

870820481 is an equidigital number, since it uses as much as digits as its factorization.

870820481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28672, while the sum is 38.

The square root of 870820481 is about 29509.6675853863. The cubic root of 870820481 is about 954.9402778731.

The spelling of 870820481 in words is "eight hundred seventy million, eight hundred twenty thousand, four hundred eighty-one".