68975821 has 2 divisors, whose sum is σ = 68975822. Its totient is φ = 68975820.

The previous prime is 68975773. The next prime is 68975857. The reversal of 68975821 is 12857986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67322025 + 1653796 = 8205^2 + 1286^2 .

It is a cyclic number.

It is not a de Polignac number, because 68975821 - 2¹⁹ = 68451533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68970821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34487910 + 34487911.

It is an arithmetic number, because the mean of its divisors is an integer number (34487911).

Almost surely, 2^68975821 is an apocalyptic number.

It is an amenable number.

68975821 is a deficient number, since it is larger than the sum of its proper divisors (1).

68975821 is an equidigital number, since it uses as much as digits as its factorization.

68975821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 46.

The square root of 68975821 is about 8305.1683306240. The cubic root of 68975821 is about 410.1086783090.

It can be divided in two parts, 68975 and 821, that added together give a palindrome (69796).

The spelling of 68975821 in words is "sixty-eight million, nine hundred seventy-five thousand, eight hundred twenty-one".