605721149 has 4 divisors (see below), whose sum is σ = 660786720. Its totient is φ = 550655580.

The previous prime is 605721107. The next prime is 605721157. The reversal of 605721149 is 941127506.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 605721149 - 2¹⁶ = 605655613 is a prime.

It is a super-2 number, since 2×605721149² = 733796220691760402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (605721449) 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, 27532769 + ... + 27532790.

It is an arithmetic number, because the mean of its divisors is an integer number (165196680).

Almost surely, 2^605721149 is an apocalyptic number.

It is an amenable number.

605721149 is a deficient number, since it is larger than the sum of its proper divisors (55065571).

605721149 is a wasteful number, since it uses less digits than its factorization.

605721149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55065570.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 605721149 is about 24611.4028247071. The cubic root of 605721149 is about 846.1049694915.

The spelling of 605721149 in words is "six hundred five million, seven hundred twenty-one thousand, one hundred forty-nine".