56821097 has 2 divisors, whose sum is σ = 56821098. Its totient is φ = 56821096.

The previous prime is 56821057. The next prime is 56821099. The reversal of 56821097 is 79012865.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48846121 + 7974976 = 6989^2 + 2824^2 .

It is a cyclic number.

It is not a de Polignac number, because 56821097 - 2¹⁰ = 56820073 is a prime.

Together with 56821099, 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 56821097.

It is not a weakly prime, because it can be changed into another prime (56821099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28410548 + 28410549.

It is an arithmetic number, because the mean of its divisors is an integer number (28410549).

Almost surely, 2^56821097 is an apocalyptic number.

It is an amenable number.

56821097 is a deficient number, since it is larger than the sum of its proper divisors (1).

56821097 is an equidigital number, since it uses as much as digits as its factorization.

56821097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 56821097 is about 7537.9769832496. The cubic root of 56821097 is about 384.4470546567.

The spelling of 56821097 in words is "fifty-six million, eight hundred twenty-one thousand, ninety-seven".