67523381 has 2 divisors, whose sum is σ = 67523382. Its totient is φ = 67523380.

The previous prime is 67523369. The next prime is 67523383. The reversal of 67523381 is 18332576.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40576900 + 26946481 = 6370^2 + 5191^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67523381 is a prime.

It is a super-2 number, since 2×67523381² = 9118813963342322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 67523383, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67523383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33761690 + 33761691.

It is an arithmetic number, because the mean of its divisors is an integer number (33761691).

Almost surely, 2^67523381 is an apocalyptic number.

It is an amenable number.

67523381 is a deficient number, since it is larger than the sum of its proper divisors (1).

67523381 is an equidigital number, since it uses as much as digits as its factorization.

67523381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 35.

The square root of 67523381 is about 8217.2611617254. The cubic root of 67523381 is about 407.2096487647.

The spelling of 67523381 in words is "sixty-seven million, five hundred twenty-three thousand, three hundred eighty-one".