65870491 has 4 divisors (see below), whose sum is σ = 66987000. Its totient is φ = 64753984.

The previous prime is 65870489. The next prime is 65870507. The reversal of 65870491 is 19407856.

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

It is a cyclic number.

It is not a de Polignac number, because 65870491 - 2¹ = 65870489 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. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65870401) 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, 558166 + ... + 558283.

It is an arithmetic number, because the mean of its divisors is an integer number (16746750).

Almost surely, 2^65870491 is an apocalyptic number.

65870491 is a deficient number, since it is larger than the sum of its proper divisors (1116509).

65870491 is a wasteful number, since it uses less digits than its factorization.

65870491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116508.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 65870491 is about 8116.0637626869. The cubic root of 65870491 is about 403.8594971829.

The spelling of 65870491 in words is "sixty-five million, eight hundred seventy thousand, four hundred ninety-one".