61323581 has 8 divisors (see below), whose sum is σ = 67651200. Its totient is φ = 55121440.

The previous prime is 61323523. The next prime is 61323593. The reversal of 61323581 is 18532316.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61323581 - 2⁶ = 61323517 is a prime.

It is a super-2 number, since 2×61323581² = 7521163173327122, 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 (61323511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30341 + ... + 32298.

It is an arithmetic number, because the mean of its divisors is an integer number (8456400).

Almost surely, 2^61323581 is an apocalyptic number.

It is an amenable number.

61323581 is a deficient number, since it is larger than the sum of its proper divisors (6327619).

61323581 is a wasteful number, since it uses less digits than its factorization.

61323581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62739.

The product of its digits is 4320, while the sum is 29.

The square root of 61323581 is about 7830.9374279201. The cubic root of 61323581 is about 394.3445434557.

Adding to 61323581 its reverse (18532316), we get a palindrome (79855897).

It can be divided in two parts, 613235 and 81, that added together give a palindrome (613316).

The spelling of 61323581 in words is "sixty-one million, three hundred twenty-three thousand, five hundred eighty-one".