64261 has 4 divisors (see below), whose sum is σ = 64800. Its totient is φ = 63724.
The previous prime is 64237. The next prime is 64271. The reversal of 64261 is 16246.
64261 is nontrivially palindromic in base 13.
64261 is a nontrivial binomial coefficient, being equal to C(359, 2).
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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16246 = 2 ⋅8123.
It is not a de Polignac number, because 64261 - 211 = 62213 is a prime.
It is a super-2 number, since 2×642612 = 8258952242, which contains 22 as substring.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (64231) 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, 1 + ... + 358.
It is an arithmetic number, because the mean of its divisors is an integer number (16200).
264261 is an apocalyptic number.
64261 is the 358-th triangular number.
64261 is the 136-th centered heptagonal number and also the 120-th centered nonagonal number.
It is an amenable number.
64261 is a deficient number, since it is larger than the sum of its proper divisors (539).
64261 is a wasteful number, since it uses less digits than its factorization.
64261 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 538.
The product of its digits is 288, while the sum is 19.
The square root of 64261 is about 253.4975345048. The cubic root of 64261 is about 40.0543012510.
It can be divided in two parts, 642 and 61, that added together give a triangular number (703 = T37).
The spelling of 64261 in words is "sixty-four thousand, two hundred sixty-one".
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