61227791 has 4 divisors (see below), whose sum is σ = 61271952. Its totient is φ = 61183632.

The previous prime is 61227779. The next prime is 61227827. The reversal of 61227791 is 19772216.

61227791 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 a de Polignac number, because none of the positive numbers 2^k-61227791 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 (61227701) 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, 19931 + ... + 22796.

It is an arithmetic number, because the mean of its divisors is an integer number (15317988).

Almost surely, 2^61227791 is an apocalyptic number.

61227791 is a deficient number, since it is larger than the sum of its proper divisors (44161).

61227791 is a wasteful number, since it uses less digits than its factorization.

61227791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44160.

The product of its digits is 10584, while the sum is 35.

The square root of 61227791 is about 7824.8189116426. The cubic root of 61227791 is about 394.1391088925.

The spelling of 61227791 in words is "sixty-one million, two hundred twenty-seven thousand, seven hundred ninety-one".