67541813 has 2 divisors, whose sum is σ = 67541814. Its totient is φ = 67541812.

The previous prime is 67541809. The next prime is 67541911. The reversal of 67541813 is 31814576.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61748164 + 5793649 = 7858^2 + 2407^2 .

It is a cyclic number.

It is not a de Polignac number, because 67541813 - 2² = 67541809 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67541113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33770906 + 33770907.

It is an arithmetic number, because the mean of its divisors is an integer number (33770907).

Almost surely, 2^67541813 is an apocalyptic number.

It is an amenable number.

67541813 is a deficient number, since it is larger than the sum of its proper divisors (1).

67541813 is an equidigital number, since it uses as much as digits as its factorization.

67541813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 35.

The square root of 67541813 is about 8218.3826267703. The cubic root of 67541813 is about 407.2466976865.

The spelling of 67541813 in words is "sixty-seven million, five hundred forty-one thousand, eight hundred thirteen".