61121643 has 8 divisors (see below), whose sum is σ = 88904256. Its totient is φ = 37043400.

The previous prime is 61121569. The next prime is 61121663. The reversal of 61121643 is 34612116.

61121643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 61121643 - 2⁸ = 61121387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61121663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 926053 + ... + 926118.

It is an arithmetic number, because the mean of its divisors is an integer number (11113032).

Almost surely, 2^61121643 is an apocalyptic number.

61121643 is a deficient number, since it is larger than the sum of its proper divisors (27782613).

61121643 is a wasteful number, since it uses less digits than its factorization.

61121643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1852185.

The product of its digits is 864, while the sum is 24.

The square root of 61121643 is about 7818.0331925619. The cubic root of 61121643 is about 393.9112097756.

Adding to 61121643 its reverse (34612116), we get a palindrome (95733759).

The spelling of 61121643 in words is "sixty-one million, one hundred twenty-one thousand, six hundred forty-three".