65021761 has 4 divisors (see below), whose sum is σ = 74310592. Its totient is φ = 55732932.

The previous prime is 65021731. The next prime is 65021767. The reversal of 65021761 is 16712056.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65021761 - 2¹³ = 65013569 is a prime.

It is a super-2 number, since 2×65021761² = 8455658807082242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65021767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4644405 + ... + 4644418.

It is an arithmetic number, because the mean of its divisors is an integer number (18577648).

Almost surely, 2^65021761 is an apocalyptic number.

It is an amenable number.

65021761 is a deficient number, since it is larger than the sum of its proper divisors (9288831).

65021761 is an equidigital number, since it uses as much as digits as its factorization.

65021761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9288830.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 65021761 is about 8063.6071952942. The cubic root of 65021761 is about 402.1174400902.

The spelling of 65021761 in words is "sixty-five million, twenty-one thousand, seven hundred sixty-one".