67651491 has 4 divisors (see below), whose sum is σ = 90201992. Its totient is φ = 45100992.

The previous prime is 67651489. The next prime is 67651511. The reversal of 67651491 is 19415676.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 67651491 - 2¹ = 67651489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67651411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11275246 + ... + 11275251.

It is an arithmetic number, because the mean of its divisors is an integer number (22550498).

Almost surely, 2^67651491 is an apocalyptic number.

67651491 is a deficient number, since it is larger than the sum of its proper divisors (22550501).

67651491 is a wasteful number, since it uses less digits than its factorization.

67651491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22550500.

The product of its digits is 45360, while the sum is 39.

The square root of 67651491 is about 8225.0526442084. The cubic root of 67651491 is about 407.4670147815.

It can be divided in two parts, 6765 and 1491, that added together give a triangular number (8256 = T₁₂₈).

The spelling of 67651491 in words is "sixty-seven million, six hundred fifty-one thousand, four hundred ninety-one".