611393945 has 4 divisors (see below), whose sum is σ = 733672740. Its totient is φ = 489115152.

The previous prime is 611393879. The next prime is 611393947. The reversal of 611393945 is 549393116.

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

It can be written as a sum of positive squares in 2 ways, for example, as 336795904 + 274598041 = 18352^2 + 16571^2 .

It is a cyclic number.

It is not a de Polignac number, because 611393945 - 2¹⁴ = 611377561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (611393947) 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, 61139390 + ... + 61139399.

It is an arithmetic number, because the mean of its divisors is an integer number (183418185).

Almost surely, 2^611393945 is an apocalyptic number.

It is an amenable number.

611393945 is a deficient number, since it is larger than the sum of its proper divisors (122278795).

611393945 is a wasteful number, since it uses less digits than its factorization.

611393945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122278794.

The product of its digits is 87480, while the sum is 41.

The square root of 611393945 is about 24726.3815589746. The cubic root of 611393945 is about 848.7381252934.

The spelling of 611393945 in words is "six hundred eleven million, three hundred ninety-three thousand, nine hundred forty-five".