61243311 has 4 divisors (see below), whose sum is σ = 81657752. Its totient is φ = 40828872.

The previous prime is 61243297. The next prime is 61243313. The reversal of 61243311 is 11334216.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 61243311 - 2⁵ = 61243279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61243313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10207216 + ... + 10207221.

It is an arithmetic number, because the mean of its divisors is an integer number (20414438).

Almost surely, 2^61243311 is an apocalyptic number.

61243311 is a deficient number, since it is larger than the sum of its proper divisors (20414441).

61243311 is a wasteful number, since it uses less digits than its factorization.

61243311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20414440.

The product of its digits is 432, while the sum is 21.

The square root of 61243311 is about 7825.8105650469. The cubic root of 61243311 is about 394.1724081623.

Adding to 61243311 its reverse (11334216), we get a palindrome (72577527).

The spelling of 61243311 in words is "sixty-one million, two hundred forty-three thousand, three hundred eleven".