1611311971 has 2 divisors, whose sum is σ = 1611311972. Its totient is φ = 1611311970.

The previous prime is 1611311963. The next prime is 1611311983. The reversal of 1611311971 is 1791131161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1611311971 - 2³ = 1611311963 is a prime.

It is not a weakly prime, because it can be changed into another prime (1611311071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805655985 + 805655986.

It is an arithmetic number, because the mean of its divisors is an integer number (805655986).

Almost surely, 2^1611311971 is an apocalyptic number.

1611311971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1611311971 is an equidigital number, since it uses as much as digits as its factorization.

1611311971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1134, while the sum is 31.

The square root of 1611311971 is about 40141.1505938731. The cubic root of 1611311971 is about 1172.3569918462.

The spelling of 1611311971 in words is "one billion, six hundred eleven million, three hundred eleven thousand, nine hundred seventy-one".