67991291 has 8 divisors (see below), whose sum is σ = 71676480. Its totient is φ = 64316808.

The previous prime is 67991269. The next prime is 67991293. The reversal of 67991291 is 19219976.

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

It is a cyclic number.

It is not a de Polignac number, because 67991291 - 2¹⁸ = 67729147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67991293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12680 + ... + 17226.

It is an arithmetic number, because the mean of its divisors is an integer number (8959560).

Almost surely, 2^67991291 is an apocalyptic number.

67991291 is a deficient number, since it is larger than the sum of its proper divisors (3685189).

67991291 is a wasteful number, since it uses less digits than its factorization.

67991291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5353.

The product of its digits is 61236, while the sum is 44.

The square root of 67991291 is about 8245.6831736370. The cubic root of 67991291 is about 408.1480843820.

The spelling of 67991291 in words is "sixty-seven million, nine hundred ninety-one thousand, two hundred ninety-one".