61147311 has 4 divisors (see below), whose sum is σ = 81529752. Its totient is φ = 40764872.

The previous prime is 61147309. The next prime is 61147337. The reversal of 61147311 is 11374116.

61147311 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 61147311 - 2¹ = 61147309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61147211) 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 3 ways as a sum of consecutive naturals, for example, 10191216 + ... + 10191221.

It is an arithmetic number, because the mean of its divisors is an integer number (20382438).

Almost surely, 2^61147311 is an apocalyptic number.

61147311 is a deficient number, since it is larger than the sum of its proper divisors (20382441).

61147311 is a wasteful number, since it uses less digits than its factorization.

61147311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20382440.

The product of its digits is 504, while the sum is 24.

The square root of 61147311 is about 7819.6746095985. The cubic root of 61147311 is about 393.9663429898.

The spelling of 61147311 in words is "sixty-one million, one hundred forty-seven thousand, three hundred eleven".