67551961 has 3 divisors (see below), whose sum is σ = 67560181. Its totient is φ = 67543742.

The previous prime is 67551959. The next prime is 67551971. The reversal of 67551961 is 16915576.

The square root of 67551961 is 8219.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 67551961 - 2¹ = 67551959 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67551901) 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 in 2 ways as a sum of consecutive naturals, for example, 4110 + ... + 12328.

Almost surely, 2^67551961 is an apocalyptic number.

67551961 is the 8219-th square number.

67551961 is the 4110-th centered octagonal number.

It is an amenable number.

67551961 is a deficient number, since it is larger than the sum of its proper divisors (8220).

67551961 is an frugal number, since it uses more digits than its factorization.

67551961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16438 (or 8219 counting only the distinct ones).

The product of its digits is 56700, while the sum is 40.

The cubic root of 67551961 is about 407.2670926209.

The spelling of 67551961 in words is "sixty-seven million, five hundred fifty-one thousand, nine hundred sixty-one".