611145309 has 4 divisors (see below), whose sum is σ = 814860416. Its totient is φ = 407430204.

The previous prime is 611145281. The next prime is 611145313. The reversal of 611145309 is 903541116.

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 not a de Polignac number, because 611145309 - 2⁷ = 611145181 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 (611145329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101857549 + ... + 101857554.

It is an arithmetic number, because the mean of its divisors is an integer number (203715104).

Almost surely, 2^611145309 is an apocalyptic number.

It is an amenable number.

611145309 is a deficient number, since it is larger than the sum of its proper divisors (203715107).

611145309 is a wasteful number, since it uses less digits than its factorization.

611145309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203715106.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 611145309 is about 24721.3533003353. The cubic root of 611145309 is about 848.6230573862.

The spelling of 611145309 in words is "six hundred eleven million, one hundred forty-five thousand, three hundred nine".