611824981 has 2 divisors, whose sum is σ = 611824982. Its totient is φ = 611824980.

The previous prime is 611824949. The next prime is 611824987. The reversal of 611824981 is 189428116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 600495025 + 11329956 = 24505^2 + 3366^2 .

It is a cyclic number.

It is not a de Polignac number, because 611824981 - 2⁵ = 611824949 is a prime.

It is a super-2 number, since 2×611824981² = 748659614751300722, which contains 22 as substring.

It is equal to p_31909549 and since 611824981 and 31909549 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (611824987) 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 as a sum of consecutive naturals, namely, 305912490 + 305912491.

It is an arithmetic number, because the mean of its divisors is an integer number (305912491).

Almost surely, 2^611824981 is an apocalyptic number.

It is an amenable number.

611824981 is a deficient number, since it is larger than the sum of its proper divisors (1).

611824981 is an equidigital number, since it uses as much as digits as its factorization.

611824981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 40.

The square root of 611824981 is about 24735.0961388874. The cubic root of 611824981 is about 848.9375334115.

The spelling of 611824981 in words is "six hundred eleven million, eight hundred twenty-four thousand, nine hundred eighty-one".