67561001 has 8 divisors (see below), whose sum is σ = 69753864. Its totient is φ = 65387520.

The previous prime is 67560971. The next prime is 67561003. The reversal of 67561001 is 10016576.

It can be written as a sum of positive squares in 4 ways, for example, as 22657600 + 44903401 = 4760^2 + 6701^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67561001 is a prime.

It is a super-2 number, since 2×67561001² = 9128977712244002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67561003) 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 7 ways as a sum of consecutive naturals, for example, 2411 + ... + 11871.

It is an arithmetic number, because the mean of its divisors is an integer number (8719233).

Almost surely, 2^67561001 is an apocalyptic number.

It is an amenable number.

67561001 is a deficient number, since it is larger than the sum of its proper divisors (2192863).

67561001 is a wasteful number, since it uses less digits than its factorization.

67561001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9691.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 67561001 is about 8219.5499268512. The cubic root of 67561001 is about 407.2852590331.

Adding to 67561001 its reverse (10016576), we get a palindrome (77577577).

The spelling of 67561001 in words is "sixty-seven million, five hundred sixty-one thousand, one".