67550981 has 2 divisors, whose sum is σ = 67550982. Its totient is φ = 67550980.

The previous prime is 67550963. The next prime is 67551053. The reversal of 67550981 is 18905576.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42640900 + 24910081 = 6530^2 + 4991^2 .

It is a cyclic number.

It is not a de Polignac number, because 67550981 - 2¹⁰ = 67549957 is a prime.

It is a super-2 number, since 2×67550981² = 9126270068124722, which contains 22 as substring.

It is a Sophie Germain prime.

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 (67550081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33775490 + 33775491.

It is an arithmetic number, because the mean of its divisors is an integer number (33775491).

Almost surely, 2^67550981 is an apocalyptic number.

It is an amenable number.

67550981 is a deficient number, since it is larger than the sum of its proper divisors (1).

67550981 is an equidigital number, since it uses as much as digits as its factorization.

67550981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 41.

The square root of 67550981 is about 8218.9403818254. The cubic root of 67550981 is about 407.2651231558.

The spelling of 67550981 in words is "sixty-seven million, five hundred fifty thousand, nine hundred eighty-one".