611531641 has 4 divisors (see below), whose sum is σ = 698893312. Its totient is φ = 524169972.

The previous prime is 611531629. The next prime is 611531651. The reversal of 611531641 is 146135116.

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 611531641 - 2¹⁵ = 611498873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (611531621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43680825 + ... + 43680838.

It is an arithmetic number, because the mean of its divisors is an integer number (174723328).

Almost surely, 2^611531641 is an apocalyptic number.

It is an amenable number.

611531641 is a deficient number, since it is larger than the sum of its proper divisors (87361671).

611531641 is an equidigital number, since it uses as much as digits as its factorization.

611531641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87361670.

The product of its digits is 2160, while the sum is 28.

The square root of 611531641 is about 24729.1657966863. The cubic root of 611531641 is about 848.8018371186.

Adding to 611531641 its reverse (146135116), we get a palindrome (757666757).

The spelling of 611531641 in words is "six hundred eleven million, five hundred thirty-one thousand, six hundred forty-one".