61335581 has 4 divisors (see below), whose sum is σ = 61644000. Its totient is φ = 61027164.

The previous prime is 61335563. The next prime is 61335601. The reversal of 61335581 is 18553316.

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 a de Polignac number, because none of the positive numbers 2^k-61335581 is a prime.

It is a super-2 number, since 2×61335581² = 7524106993215122, 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 (61335511) 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, 153911 + ... + 154308.

It is an arithmetic number, because the mean of its divisors is an integer number (15411000).

Almost surely, 2^61335581 is an apocalyptic number.

It is an amenable number.

61335581 is a deficient number, since it is larger than the sum of its proper divisors (308419).

61335581 is a wasteful number, since it uses less digits than its factorization.

61335581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308418.

The product of its digits is 10800, while the sum is 32.

The square root of 61335581 is about 7831.7035822355. The cubic root of 61335581 is about 394.3702639904.

Adding to 61335581 its reverse (18553316), we get a palindrome (79888897).

It can be divided in two parts, 61335 and 581, that added together give a palindrome (61916).

The spelling of 61335581 in words is "sixty-one million, three hundred thirty-five thousand, five hundred eighty-one".