68990461 has 2 divisors, whose sum is σ = 68990462. Its totient is φ = 68990460.

The previous prime is 68990431. The next prime is 68990473. The reversal of 68990461 is 16409986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43639236 + 25351225 = 6606^2 + 5035^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68990461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68990401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34495230 + 34495231.

It is an arithmetic number, because the mean of its divisors is an integer number (34495231).

Almost surely, 2^68990461 is an apocalyptic number.

68990461 is the 4796-th hex number.

It is an amenable number.

68990461 is a deficient number, since it is larger than the sum of its proper divisors (1).

68990461 is an equidigital number, since it uses as much as digits as its factorization.

68990461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 68990461 is about 8306.0496627458. The cubic root of 68990461 is about 410.1376912115.

The spelling of 68990461 in words is "sixty-eight million, nine hundred ninety thousand, four hundred sixty-one".