61343521 has 6 divisors (see below), whose sum is σ = 63047670. Its totient is φ = 59684256.

The previous prime is 61343467. The next prime is 61343537. The reversal of 61343521 is 12534316.

It can be written as a sum of positive squares in 3 ways, for example, as 40768225 + 20575296 = 6385^2 + 4536^2 .

It is not a de Polignac number, because 61343521 - 2⁷ = 61343393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61343591) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21036 + ... + 23773.

It is an arithmetic number, because the mean of its divisors is an integer number (10507945).

Almost surely, 2^61343521 is an apocalyptic number.

It is an amenable number.

61343521 is a deficient number, since it is larger than the sum of its proper divisors (1704149).

61343521 is an equidigital number, since it uses as much as digits as its factorization.

61343521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44883 (or 44846 counting only the distinct ones).

The product of its digits is 2160, while the sum is 25.

The square root of 61343521 is about 7832.2104798071. The cubic root of 61343521 is about 394.3872805668.

Adding to 61343521 its reverse (12534316), we get a palindrome (73877837).

The spelling of 61343521 in words is "sixty-one million, three hundred forty-three thousand, five hundred twenty-one".