65213261 has 4 divisors (see below), whose sum is σ = 65283072. Its totient is φ = 65143452.

The previous prime is 65213251. The next prime is 65213273. The reversal of 65213261 is 16231256.

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 65213261 - 2¹⁴ = 65196877 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65213261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65213201) 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, 33485 + ... + 35378.

It is an arithmetic number, because the mean of its divisors is an integer number (16320768).

Almost surely, 2^65213261 is an apocalyptic number.

It is an amenable number.

65213261 is a deficient number, since it is larger than the sum of its proper divisors (69811).

65213261 is an equidigital number, since it uses as much as digits as its factorization.

65213261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69810.

The product of its digits is 2160, while the sum is 26.

The square root of 65213261 is about 8075.4728034958. The cubic root of 65213261 is about 402.5118209560.

It can be divided in two parts, 6521 and 3261, that multiplied together give a triangular number (21264981 = T₆₅₂₁).

The spelling of 65213261 in words is "sixty-five million, two hundred thirteen thousand, two hundred sixty-one".