61343681 has 4 divisors (see below), whose sum is σ = 70107072. Its totient is φ = 52580292.

The previous prime is 61343677. The next prime is 61343687. The reversal of 61343681 is 18634316.

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 61343681 - 2² = 61343677 is a prime.

It is a super-2 number, since 2×61343681² = 7526094397259522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61343687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4381685 + ... + 4381698.

It is an arithmetic number, because the mean of its divisors is an integer number (17526768).

Almost surely, 2^61343681 is an apocalyptic number.

It is an amenable number.

61343681 is a deficient number, since it is larger than the sum of its proper divisors (8763391).

61343681 is an equidigital number, since it uses as much as digits as its factorization.

61343681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8763390.

The product of its digits is 10368, while the sum is 32.

The square root of 61343681 is about 7832.2206940305. The cubic root of 61343681 is about 394.3876234550.

Adding to 61343681 its reverse (18634316), we get a palindrome (79977997).

The spelling of 61343681 in words is "sixty-one million, three hundred forty-three thousand, six hundred eighty-one".