67671581 has 2 divisors, whose sum is σ = 67671582. Its totient is φ = 67671580.

The previous prime is 67671563. The next prime is 67671613. The reversal of 67671581 is 18517676.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35295481 + 32376100 = 5941^2 + 5690^2 .

It is a cyclic number.

It is not a de Polignac number, because 67671581 - 2⁶ = 67671517 is a prime.

It is a super-2 number, since 2×67671581² = 9158885750079122, which contains 22 as substring.

It is a Sophie Germain 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 (67671281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33835790 + 33835791.

It is an arithmetic number, because the mean of its divisors is an integer number (33835791).

Almost surely, 2^67671581 is an apocalyptic number.

It is an amenable number.

67671581 is a deficient number, since it is larger than the sum of its proper divisors (1).

67671581 is an equidigital number, since it uses as much as digits as its factorization.

67671581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70560, while the sum is 41.

The square root of 67671581 is about 8226.2738223329. The cubic root of 67671581 is about 407.5073450192.

The spelling of 67671581 in words is "sixty-seven million, six hundred seventy-one thousand, five hundred eighty-one".