68121457 has 2 divisors, whose sum is σ = 68121458. Its totient is φ = 68121456.

The previous prime is 68121437. The next prime is 68121467. The reversal of 68121457 is 75412186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40653376 + 27468081 = 6376^2 + 5241^2 .

It is a cyclic number.

It is not a de Polignac number, because 68121457 - 2¹⁹ = 67597169 is a prime.

It is not a weakly prime, because it can be changed into another prime (68121407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34060728 + 34060729.

It is an arithmetic number, because the mean of its divisors is an integer number (34060729).

Almost surely, 2^68121457 is an apocalyptic number.

It is an amenable number.

68121457 is a deficient number, since it is larger than the sum of its proper divisors (1).

68121457 is an equidigital number, since it uses as much as digits as its factorization.

68121457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 34.

The square root of 68121457 is about 8253.5723780676. The cubic root of 68121457 is about 408.4083781920.

The spelling of 68121457 in words is "sixty-eight million, one hundred twenty-one thousand, four hundred fifty-seven".