856424501 has 2 divisors, whose sum is σ = 856424502. Its totient is φ = 856424500.

The previous prime is 856424447. The next prime is 856424537. The reversal of 856424501 is 105424658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 752404900 + 104019601 = 27430^2 + 10199^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856424501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856424561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428212250 + 428212251.

It is an arithmetic number, because the mean of its divisors is an integer number (428212251).

Almost surely, 2^856424501 is an apocalyptic number.

It is an amenable number.

856424501 is a deficient number, since it is larger than the sum of its proper divisors (1).

856424501 is an equidigital number, since it uses as much as digits as its factorization.

856424501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38400, while the sum is 35.

The square root of 856424501 is about 29264.7313502106. The cubic root of 856424501 is about 949.6488086935.

The spelling of 856424501 in words is "eight hundred fifty-six million, four hundred twenty-four thousand, five hundred one".