61228091 has 4 divisors (see below), whose sum is σ = 62383392. Its totient is φ = 60072792.

The previous prime is 61228061. The next prime is 61228117. The reversal of 61228091 is 19082216.

61228091 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 61228091 - 2¹⁴ = 61211707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61228031) 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, 577571 + ... + 577676.

It is an arithmetic number, because the mean of its divisors is an integer number (15595848).

Almost surely, 2^61228091 is an apocalyptic number.

61228091 is a deficient number, since it is larger than the sum of its proper divisors (1155301).

61228091 is a wasteful number, since it uses less digits than its factorization.

61228091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155300.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 61228091 is about 7824.8380813918. The cubic root of 61228091 is about 394.1397526172.

The spelling of 61228091 in words is "sixty-one million, two hundred twenty-eight thousand, ninety-one".