65049891 has 4 divisors (see below), whose sum is σ = 86733192. Its totient is φ = 43366592.

The previous prime is 65049889. The next prime is 65049893. The reversal of 65049891 is 19894056.

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

It is an interprime number because it is at equal distance from previous prime (65049889) and next prime (65049893).

It is a cyclic number.

It is not a de Polignac number, because 65049891 - 2¹ = 65049889 is a prime.

It is a super-2 number, since 2×65049891² = 8462976638223762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65049893) 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, 10841646 + ... + 10841651.

It is an arithmetic number, because the mean of its divisors is an integer number (21683298).

Almost surely, 2^65049891 is an apocalyptic number.

65049891 is a deficient number, since it is larger than the sum of its proper divisors (21683301).

65049891 is a wasteful number, since it uses less digits than its factorization.

65049891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21683300.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 65049891 is about 8065.3512632743. The cubic root of 65049891 is about 402.1754203345.

The spelling of 65049891 in words is "sixty-five million, forty-nine thousand, eight hundred ninety-one".