611180981 has 2 divisors, whose sum is σ = 611180982. Its totient is φ = 611180980.

The previous prime is 611180959. The next prime is 611180987. The reversal of 611180981 is 189081116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 525784900 + 85396081 = 22930^2 + 9241^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-611180981 is a prime.

It is a super-2 number, since 2×611180981² = 747084383072244722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (611180987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305590490 + 305590491.

It is an arithmetic number, because the mean of its divisors is an integer number (305590491).

Almost surely, 2^611180981 is an apocalyptic number.

It is an amenable number.

611180981 is a deficient number, since it is larger than the sum of its proper divisors (1).

611180981 is an equidigital number, since it uses as much as digits as its factorization.

611180981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 35.

The square root of 611180981 is about 24722.0747713455. The cubic root of 611180981 is about 848.6395681856.

The spelling of 611180981 in words is "six hundred eleven million, one hundred eighty thousand, nine hundred eighty-one".