1611147961 has 2 divisors, whose sum is σ = 1611147962. Its totient is φ = 1611147960.

The previous prime is 1611147949. The next prime is 1611147971. The reversal of 1611147961 is 1697411161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1571646736 + 39501225 = 39644^2 + 6285^2 .

It is a cyclic number.

It is not a de Polignac number, because 1611147961 - 2⁵ = 1611147929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1611147961.

It is not a weakly prime, because it can be changed into another prime (1611147911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805573980 + 805573981.

It is an arithmetic number, because the mean of its divisors is an integer number (805573981).

Almost surely, 2^1611147961 is an apocalyptic number.

It is an amenable number.

1611147961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1611147961 is an equidigital number, since it uses as much as digits as its factorization.

1611147961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 37.

The square root of 1611147961 is about 40139.1076258554. The cubic root of 1611147961 is about 1172.3172137445.

The spelling of 1611147961 in words is "one billion, six hundred eleven million, one hundred forty-seven thousand, nine hundred sixty-one".