67149909 has 6 divisors (see below), whose sum is σ = 96994326. Its totient is φ = 44766600.

The previous prime is 67149893. The next prime is 67149913. The reversal of 67149909 is 90994176.

It can be written as a sum of positive squares in only one way, i.e., 40678884 + 26471025 = 6378^2 + 5145^2 .

It is not a de Polignac number, because 67149909 - 2⁴ = 67149893 is a prime.

It is a super-2 number, since 2×67149909² = 9018220557416562, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67149809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3730542 + ... + 3730559.

It is an arithmetic number, because the mean of its divisors is an integer number (16165721).

Almost surely, 2^67149909 is an apocalyptic number.

It is an amenable number.

67149909 is a deficient number, since it is larger than the sum of its proper divisors (29844417).

67149909 is a wasteful number, since it uses less digits than its factorization.

67149909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7461107 (or 7461104 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 67149909 is about 8194.5048050508. The cubic root of 67149909 is about 406.4575011283.

The spelling of 67149909 in words is "sixty-seven million, one hundred forty-nine thousand, nine hundred nine".