68154421 has 2 divisors, whose sum is σ = 68154422. Its totient is φ = 68154420.

The previous prime is 68154413. The next prime is 68154491. The reversal of 68154421 is 12445186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65431921 + 2722500 = 8089^2 + 1650^2 .

It is a cyclic number.

It is not a de Polignac number, because 68154421 - 2³ = 68154413 is a prime.

It is equal to p_4015876 and since 68154421 and 4015876 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68154491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34077210 + 34077211.

It is an arithmetic number, because the mean of its divisors is an integer number (34077211).

Almost surely, 2^68154421 is an apocalyptic number.

It is an amenable number.

68154421 is a deficient number, since it is larger than the sum of its proper divisors (1).

68154421 is an equidigital number, since it uses as much as digits as its factorization.

68154421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7680, while the sum is 31.

The square root of 68154421 is about 8255.5690900143. The cubic root of 68154421 is about 408.4742438943.

It can be divided in two parts, 6815 and 4421, that added together give a square (11236 = 106²).

The spelling of 68154421 in words is "sixty-eight million, one hundred fifty-four thousand, four hundred twenty-one".